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प्रश्न
How are extrusive and intrusive rocks formed?
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उत्तर
When the molten lava comes on the earth’s surface, it rapidly cools down and becomes solid. Rocks formed in this way on the crust are extrusive igneous rocks.
Sometimes the molten magma cools down deep inside the earth’s crust. Solid rocks so formed are actually intrusive igneous rocks.
संबंधित प्रश्न
Name three types of rocks.
Tick the correct answer
The rock which is made up of molten magma is
Tick the correct answer
Gold, petroleum and coal are examples of
Tick the correct answer
Rocks which contain fossils are
Match the following
| A | B | ||
| (i) | Core | (a) | Earth’s surface |
| (ii) | Minerals | (b) | Used for roads and buildings |
| (iii) | Rocks | (c) | Made of silicon and alumina |
| (iv) | Clay | (d) | Has definite chemical composition |
| (v) | Sial | (e) | Innermost layer |
| (f) | Changes into slate | ||
| (g) | Process of transformation of the rock | ||
Give reasons
Limestone is changed into marble.
What are minerals?
How are minerals useful for mankind?
What is the mineral most commonly used in the following object?
What is the mineral most commonly used in the following object?
