In our solar system, Earth, Mars, Mercury and Venus are terrestrial, or rocky, planets. Its density gradually increased, the temperature inside increased. (a) Loss of primordial atmosphere containing a thin layer of hydrogen and helium as a result of stripping off by solar winds. Download books and chapters from book store. [�ƣ�F�����|&�=���9�҄�գ���a~yU߮f��asO���z�^����|��2�U'���qr�.���� �$z?�/�@ (�գ�?=;���r�������p=?���sU����ŀ^��k����bsi��l3\��h��H���淛�Jv�p�8��5F�Qo�7G7����d�Zo��ƚ��xn���b$�?Y�;������o�O�Es�K�x�Vl�~*�h�D���C��:U��s�B�T߫�����I�Q�Q3�N���Xu�Η��3u��^]�+u���j�Qs�_��Z�ku���V����B��~�@�j��j��?_.`��l}UTIm����]��>���1�.�¶ jt�=�2U/������G�>�y+����O�W�կྮ__X�o)Xj�L��U k?�7�Е� _Ě�P�Ӳ�v�F:^,��ч�Îrp��q�̂��z����� 3����6�2�+}�v7o�o��+��p�����eb5|�Z�#u�9QO�zv��jb=o�~h6��������f�ٌ�I5���K1�=�p��@�$��8p:5 Both Mars and Earth have permanent polar ice caps. 237 0 obj <>stream There are four rocky planets in our Solar System: Mercury, Venus, Earth, and Mars. They are similar to Earth in composition. 2021 Zigya Technology Labs Pvt. Starting from the surface of the earth to the central part, distinct layers like crust, mantle, outer core and inner core were formed. The solar wind was most intense nearer the sun; so, it blew off lots of gas and dust from the terrestrial planets. (a) 13.7 billion (c) 4.6 billion (b) 3.8 million (d) 3.8 billion 2. And these planets are also nearer to the sun. The diffe rence between terrestrial and jovian planets can be attributed to the following conditions: (i) The terrestrial planets were formed in the close vicinity of the parent star where it was too warm for gases to condense to solid particles. Answer the following questions in about 30 words. (ii) What is the basic difference in the arguments related to the origin of the earth given by : Of the four terrestrial planets, Earth is the largest, and the only one with extensive regions of … Why are they called by this name ? Delhi - 110058. It was named about the Roman messenger god that was known for moving fast, because the planet orbited the sun more quickly than other planets. Mercury weighs in at barely 5% of Earth's mass, perhaps because it formed under harsh conditions close to the Sun. Terrestrial planets are also known as Telluric or Rocky planets. “But we don’t see such large variation, meaning it’s most likely a terrestrial planet like Mercury, Venus, Mars and Earth.” ... including more than 500 likely rocky planets. It’s thought that many civilizations recognized the planet Mercury as far back as 5,000 years. Geography Book Store. Rather than having thin atmospheres around relatively large rocky bodies, the jovian planets have relatively small, dense cores surrounded by massive layers of gas. The process of photosynthesis was initially confined to oceans only and thus oceans started filling up with the oxygen. The general structures of the jovian planets are opposite those of the terrestrial planets. Clumps of small, glassy particles may be responsible for the formation of giant asteroids and the planetary "embryos" that collided to form rocky planets like Earth, a new study suggests. The carbon dioxide in the atmosphere got dissolved in rainwater and the temperature further decreased causing more condensation and more rains. Name the terrestrial planets. The terrestrial planets are rocky because they are earth-like and are made up of rocks and metals and have relatively high densities. There are three distinct stages in the evolution of the earth : Stage I : In this stage planetesimals accretion happened and the earth originated. Terrestrial planets (Earth sized and smaller) are rocky worlds, composed of rock, silicate, water and/or carbon. Venus is similar in size to our own planet. These are similar to Earth in composition. Rocky planets are smaller than gas planets, but are made of heavier materials. They are known as terrestrial planets because their structure is rocky similar to that of the Earth. Jovian planets were formed at quite a distant location. Which one of the following is not related to the formation or modification of the present atmosphere ? It is also called expanding universe hypothesis. The surfaces of terrestrial planets have mountains, craters, canyons, and volcanoes. The name stems from the ancient term for Earth, which was "Terra". Mostly rock and metal was left in this zone and clumped together to form the inner rocky planets. %PDF-1.6 %���� Ans. That is why terrestrial planets are also called “Earth-like” planets, due to the similarity in the structure of the planet Earth. They have a hot core surrounded by a layer of hot rock called the mantle. Rocky planet facts. (iii)There was a giant-impact on the earth during the formation of the moon which heated it up further which lead to differentiated layered structure of the earth. During the creation of the solar system, there were likely more terrestrial planetoids or very large asteroids, which probably merged or were destroyed. Other articles where Terrestrial planet is discussed: planet: Planets of the solar system: …Mercury to Mars, are called terrestrial planets; those from Jupiter to Neptune are called giant planets or Jovian planets. (ii)The heavier materials like nickel and iron sank towards the centre of the earth and the lighter ones moved towards the surface. Our solar system is composed of four terrestrial planets: Mercury, Venus, Earth, and Mars. Fundamental of Physical Geography Subject Chosen. | EduRev Humanities/Arts Question is disucussed on EduRev Study Group by 160 Humanities/Arts Students. Download the PDF Question Papers Free for off line practice and view the Solutions online. The planets that falls under the title “terrestrial” planets are Mercury, Venus, Earth and Mars . Fundamental of Physical Geography Subject Chosen. https://www.zigya.com/share/R0VFTjExMDAyMjY4. Why are the inner planets rocky while others are mostly in gaseous form? Write an explanatory note on the ‘Big Bang Theory’. The diffe rence between terrestrial and jovian planets can be attributed to the following conditions: (i) The terrestrial planets were formed in the close vicinity of the parent star where it was too warm for gases to condense to solid particles. Jovian planets were Mercury, Venus, Earth, and Mars are called "terrestrial planets". Explain our ideas about why the terrestrial planets are rocky and have less gas than the giant planets. The term “Terrestrial” is made of Latin word for Earth “Terra”. �8N8�F�������>7����> V��s!En `��Ŷ�r}$�2`;L�Q����"Ő�D\邭� �(L�$�� ���/�g�D޲���������y�ԭ���t�z�@���Z�Z���u��\d�ն�Z�9�Z�ZW�(p��`�CI�];��U�;�y�{�|'|hH�G�������d�peV`�f#� +hSԩ`�Q��\۠�W�D��?KGԍr6ёh]� f��.��e�7O��$�_��J���\�@. Earth's atmosphere contains water vapor, which helps to moderate daily temperatures. h��Z[s7�+�H*Ūu��RT���,&�MW?vc�f�qf�$����#�L�` �� ��Z���H�v�M�D�hm�h�|]c}c�Bcbjbl�6 z6 ��&����1�2�[�5:+���DJ-�)�kRj2���+~��:>���������x\6ߨ�W 46�Ճ�dy�X�[�A����.D���uc]����p��0�VkPXn�~�^������׳ˁk�y��Y��û 1��u��f/�����/]H?�c��l3���] ��m6�_Fx? Answer: Mercury, Venus, Earth and Mars. (b) The hot interior of the earth : Contributing to the evolution of the earth. The gases were outpoured from the interior of the earth during the cooling of the earth through the process called degassing. In the previous section, we discussed the formation of a star via the collapse of a big cloud of gas.It is worth noticing that the eight planets in our solar system make up two different groups; the four planets closest to the Sun make up the rocky terrestrial planets and the four planets farthest from the Sun make up the gaseous jovian planets. On the surface is a thin layer of solid rock called the crust. A terrestrial planet, telluric planet, or rocky planet is a planet that is composed primarily of silicate rocks or metals. 232, Block C-3, Janakpuri, New Delhi, Chapter Chosen. The composition of a planet’s atmosphere has roots deep beneath its surface. Ltd. Download books and chapters from book store. This started the evolution of the early atmosphere which largely contained water vapour, nitrogen, carbon dioxide, methane, ammonia and very little of free oxygen. For planets outside our solar system, those between half of Earth’s size to twice its radius are considered terrestrial and others may be even smaller. Jovian Planets: The planets outside the orbit of Mars, namely Jupiter, Saturn, Uranus and Neptune are called outer planets because they are much farther off than inner planets. To determine if some of these worlds have atmospheres, oceans or other signs of habitability, it takes more investigation. A terrestrial planet, telluric planet, or rocky planet is a planet that is composed primarily of silicate rocks or metals.Within the Solar System, the terrestrial planets accepted by the IAU are the inner planets closest to the Sun, i.e. Table 12.1 summarizes the main properties of the planets in our solar system (Pluto is an oddball planet that does not fall into either category, sharing many properties with the “Kuiper belt” objects.) However, the modest mass of Mars is perplexing. The most popular argument regarding the origin of the universe is the Big Bang Theory. Definitions Cut-aways of the terrestrial planets showing their interiors. Exoplanets twice the size of Earth and larger may be rocky as well, but those are considered super-Earths. The solar wind was most intense nearer the sun; so, it blew off lots of gas and dust from the terrestrial planets. Answer The terrestrial planets are rocky because: • The terrestrial planets were formed in the close vicinity of the parent star where it was too warm for gases to condense to solid particles. Sometimes planets move or migrate towards their host star. There are four terrestrial planets in our solar system, which also happen to be the four closest to the sun: Mercury, Venus, Earth and Mars. These are also called terrestrial planets because their structure is rocky similar to that of Earth. Answer The terrestrial planets are rocky because: • The terrestrial planets were formed in the close vicinity of the parent star where it was too warm for gases to condense to solid particles. The terrestrial planets are rocky because they are earth-like and are made up of rocks and metals and have relatively high densities. Which one of the following has the longest duration ? While the Jovian planets are giant balls of gas. Earth. (i) Why are the terrestrial planets rocky? (b) Planets between the sun and the belt of asteroids (c) Planets in gaseous state (d) Planets without satellite(s) (v) Life on the earth appeared around how many years before the present? | EduRev Humanities/Arts Question is disucussed on EduRev Study Group by 160 Humanities/Arts Students. Why are the inner planets rocky while others are mostly in gaseous form? Stage III : Evolution of Atmosphere and Hydrosphere : There are three stages in the evolution of the present day atmosphere. About 75% of Earth’s surface is covered in water. They are the closest four planets to the Sun. Jovian planets were formed at quite a distant location. They are similar to Earth in composition. Heat from the Sun evaporated lightweight elements like hydrogen and helium into interplanetary space. Download books and chapters from book store. Whereas there is only one terrestrial planet in our Solar System that is capable of supporting life … The size difference between the Jovian and terrestrial planets in the solar system occurs because of the planets' proximity to the Sun and chemical composition. As the earth cooled, the water vapour released started getting condensed. Mercury weighs in at barely 5% of Earth's mass, perhaps because it formed under harsh conditions close to the Sun. Within the Solar System, the terrestrial planets are the inner planets closest to the Sun, i.e. The outer planets Jupiter, Saturn, Uranus and Neptune are known as the "gas giants". As a result, the material inside started getting separated depending upon their densities. Larger terrestrial exoplanets (those at least twice as massive as Earth) are classified as super-Earths. The Earth Book Chosen. Heat from the Sun evaporated lightweight elements like hydrogen and helium into interplanetary space. Chapter Chosen. However, the modest mass of Mars is perplexing. It was a barren, rocky and hot object-with a thin atmosphere of hydrogen and helium. The rainwater falling onto the surface got collected in the depressions to give rise to oceans. The terrestrial planets are rocky planets that have properties similar to that of the Earth. A new study of how carbon is trapped and released by iron-rich volcanic magma offers clues about the early atmospheric evolution on Mars and other terrestrial bodies. Terrestrial planets have the identical type of structure. Dec 12,2020 - why are the terrestrial planets rocky Related: Formation of Planets? Rocky planets are made mostly of rock and metal. These are also called terrestrial planets because their structure is rocky similar to that of Earth. Answer: Mercury, Venus, Earth and Mars are called "rocky" or "terrestrial" planets. Terrestrial planets are rocky because their composition is similar to the earth's composition.and rock and metal will be more in this zone.these have a hard surface.example:: Mercury, Venus,earth and mars are the terrestrial planets in our solar system. Both Mars and Earth have permanent polar ice caps. Over a period of time it cooled and solidified and condensed into a smaller size which later led to the formation of crust. That's because most of their mass lies in their huge atmospheres that smother the tiny rocky cores deep inside. And these planets are also nearer to the sun. (i) Why are the terrestrial planets rocky? Between these two main groups is a belt of numerous small bodies called asteroids. The terrestrial planets are also sometimes referred to as the “rocky” planets. The solar wind was most intense nearer the sun; so, it blew off lots of gas and dust from the terrestrial planets. Dec 12,2020 - why are the terrestrial planets rocky Related: Formation of Planets? Formation of Hydrosphere : The continuous volcanic eruptions contributed water vapour and gases to the atmosphere. (c) Finally, the composition of the atmosphere was modified by the living world through the process of photosynthesis. Terrestrial planets mean earth-like planets. Geography Book Store. Why are the inner planets rocky while others are mostly in gaseous form? The four rocky planets are Mercury, Venus, Earth and Mars. Which one of the following figures represents the age of the earth ? Venus is similar in size to our own planet. They are called the inner planets. Life could be likelier on icy planets than rocky ones. Made almost entirely of hydrogen and helium, these planets do not have solid surfaces. :����~x��!ј��ô� Terrestrial planets mean earth-like planets. The Sun's rocky planets come in a range of sizes. Thus earth's oceans (hydrosphere) were formed within 500 million years from the formation of the earth. The Earth Book Chosen. List the stages in the evolution of the earth and explain each stage in brief. The terrestrial planets are also sometimes referred to as the “rocky” planets. o��E>r1�]������,r��aLQS�*��DM$�)��U>Qۢ�M�� �t���?Q� QΪn��GU��V��َf5��s�oͨ�zٙj"6b*�&�jDn������r��v�w�-�����ٌ���-@^hGd�ăA�\�}���L�����X�k���S��]��DMw�*���5PZ��[�؂I��f��|����� ?җe�n���'s�|���le{�lL���1PTO�5��jyl� ����-�7�e�Z:K+�u����T�S��y�7���E�sg��tp�ҭ��;��s���V�wt�g׹K%>Q���f'fdv��;H��+V�"�����7ij���D�aĴ���'�F�P1�� �..y����{�hߎfL���F����e�Ʉ��s����G��6K;�e����m�?������b��5R��]��`t�.uK_\t�1�`j��VD]�p�>����h �i���]�5���݀J�%)�U��з6�@ùy�H�8/]h��]ia}�tF,�48O���#��$�=�P1�O}��y�N��fR�:r,f�1GZ��. When mantle material melts to form magma, it traps subsurface carbon. Mercury, Venus, Earth, and Mars. There are four terrestrial planets in our solar system, which also happen to be the four closest to the sun: Mercury, Venus, Earth and Mars. Approximately 4.6 billion years ago, the Question 14. Like the other terrestrial planets, Earth has a rocky surface with mountains and canyons, and a heavy-metal core. The Sun's rocky planets come in a range of sizes. Jovian planets were formed at quite a distant location. Terrestrial planets have surfaces that are rocky and may also have atmospheric gases. Inner or Terrestrial Planets: First four planets Mercury, Venus, Earth and Mars are much nearer to the Sim and have less number of satellites. During the creation of the solar system, there were likely more terrestrial planetoids or very large asteroids, which probably merged … © Jovian planets were Eventually, oceans got saturated with oxygen and the oxygen started to flood the atmosphere. Also known as a telluric or rocky planet, a terrestrial planet is a celestial body that is composed primarily of silicate rocks or metals and has a solid surface. So some of the small rocky planets are actually the cores of bigger planets that have been stripped of their atmosphere. The terrestrial planets are rocky because they are earth-like and are made up of rocks and metals and have relatively high densities. They are made of rocks and metals. Jovian planets lie beyond the frost line, which separates the four terrestrial planets from the gaseous Jovian planets. �������٫g{��Oz[�n wQ�{f`� ��9�Ju�T%�j��Pcک4���U>��G#)��Ş��+��H���i|�1��������V�m��Q�)m�ڣ���eͬ�'Zs���B�Y�;��z�7P�W��|�Y}�wt�|�@�����:M;�0�8=�E ��s�a����;t6/��pG�V�vv=_`��|��f�����oߜ�8}������f5lί�����)�@Z:^T:��4Z����:�k�ޒ���5�޼_2��8=~�|rz�bv��#U�oDj���$�[��T"�!3U����8{�8ɽ}g��C�L�&u sI��5"�i�E�m;�Oe�z �$o:���t������[��[�{d�ȨI�%C��F�q `��Z C—�� As the planet gets closer to the star, its atmosphere heats up causing the atoms and molecules to move very fast and escape the planet’s gravitational pull. Layer of hydrogen and helium as a result of stripping off by solar winds it takes more investigation was! 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