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Geography [3 Mark Question Answer]

Earth’s Structure · ICSE STD 9 (ICSE - English Medium). 3 questions.

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[3 Mark Question Answer]

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Question 13 Marks
What are the consequences of the pressure and temperature in the interior of the earth?
Answer
Due to the extreme temperature of $2200^\circ C,$ every matter is in liquid and gaseous state in the interior core, the temperature in the mantle ranges from $870^\circ C$ to $2200^\circ C,$ so things are in semi $-$ liquid to liquid state, the crust, a layer of $60 \ km,$ breadth, is made of solid rocks with a density of $2 – 3 g/Cm^3$. The density goes on increasing to $3-4g/Cm^3$ in the mantle and $10-13 g/Cm^3$​​​​​​​ in the core.
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Question 23 Marks
There are two transitional zones between the two consecutive layers of the interior of the earth. Name them and state their chief characteristics.
Answer
The transitional zone between crust and mantle is Moho Discontinuity which is the dividing zone between solid and semi-solid state of rocks due to the increasing temperature as the depth increases. The boundary between mantle and core is known as Gutenberg Discontinuity, below this zone both density and temperature going on increasing. The density is more than 13 and temperature is more than 2200°C.
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Question 33 Marks
The study of meteorites helps scientists to know about the interior of the earth.
Answer
At the time of the origin of the earth every planet and meteorites were floating in the space and the materials of the earth were same as that of the meteorites. So, the scientists can calculate the composition of rocks ofthe earth by studying the materials found in the meteorites.
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[3 Mark Question Answer] - Geography STD 9 Questions - Vidyadip