Question

7. Define the following:
i. Core
ii. Mantle
iii. Primary rock
iv. Endogenic forces
v. Exogenic forces

Answer 1

Answer:

Core- Earth's core is the very hot, very dense center of our planet. The ball-shaped core lies beneath the cool, brittle crust and the mostly-solid mantle

Mantle-mantle is a layer inside a planetary body bounded below by a core and above by a crust. Mantles are made of rock or ices, and are generally the largest and most massive layer of the planetary body. Mantles are characteristic of planetary bodies that have undergone differentiation by density.

Primary Rock-term early used for rocks supposed to have been first formed, being crystalline and containing no organic remains, as granite, gneiss, etc.; – called also primitive rocks.

Endogenic Forces-The forces that act in the interior of the earth are called endogenic forces.

Exogenic Forces-The forces that work on the surface of the earth are called exogenic forces.

Answer 2

Explanation:

Core - The innermost layer of the Earth and has radius about 3500 km. It is the most inaccessible layer lying around the center of the Earth. It is the heaviest part of the Earth and is made up of Nickel and Iron. Thus it is called NIFE.

Mantle - The mantel is just below the crust and extended at the depth of about 2900km , below the crust. At the depth of about 100 - 250 km , the mantle is partially a molten. Thus region is known as asthenosphere.

Primary Rock - The primary Rock is also known as the igneous rock . This is so because they were formed by the cooling of molten magma and the first rock to be formed and all other rocks are made from them only

Endogenic Force - Endogenic force or endogenetic pressure that originate inside the Earth , there fore they are called internal force which occur inside the Earth.

Exogenic force - The force which derive their strength from Earth's exterior or originate within the Earth's atmosphere.