1. Define the term ‘Rock’. 1
2. What do you mean by a Rock Cycle? 1
3. How are extrusive igneous rocks formed? 1
4. What are Exogenic & Indogenic forces? 1
5. What is an Earthquake? How is it measured? (1+2=3)
6. Why are Igneous rocks known as primary rocks? Explain the origin of Igneous rocks in
detail. Give examples.
Answers
Answer:
1.Rock, in geology, naturally occurring and coherent aggregate of one or more minerals. Such aggregates constitute the basic unit of which the solid Earth is composed and typically form recognizable and mappable volumes.
2.The process of transformation of rocks from one form to an other in a cyclic manner is known as the rock cycle. It includes the following processes: Hot lava cools down to form igneous rocks. These igneous rocks are then broken down into small particles which are transported and then deposited.
3.Extrusive igneous rocks are formed by the cooling of molten magma on the earth's surface.
4.(the image pined above)
5.An earthquake is defined as a tremor below the surface of the earth which causes shaking of the earth.Ritcher scale is used to measure the intensity of earthquake.
6.Rocks which are formed by solidification of magma are known as primary rocks. Igneous rocks are considered as the primary rocks as these are the rocks which form from the material that comes from below the earth. Igneous rocks are one of the three basic rock types. Other two are sedimentary and metamorphic.origin: Igneous rocks are formed by gradual cooling and solidification of magma. For example: granite, basalt, gabbro etc.
Answer:
1.A Rock is defined as an aggregate of minerals that forms more or less a definite unit of the earth's crust.
2.The continuous process of transformation of old rocks into new ones is known as Rock Cycle.
3.Extrusive Igneous rocks are formed by cooling of molten magma on the earth's surface.
4.The forces operating on the surface of the Earth, not inside the Earth which cause formation of landforms are called Exogenic Forces. The pressure that originates inside the Earth are called Endogenic Forces.
5.An earthquake is defined as a tremor below the surface of the Earth which causes shaking of the crust. An earthquake is measured by Seismograph.
6.Igneous rocks are called primary rocks because they were the first rocks to be formed on the earth. These rocks were formed due to cooling, solidification and crystallization of hot molten material of the earth (magma) found at the great deapths in the interior of the earth.
Example: Basalt, Granite etc.
I hope it helps you!!!