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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.
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संबंधित प्रश्न
What is a rock?
What are the uses of rocks?
Tick the correct answer
Rocks which contain fossils are
Tick the correct answer
The thinnest layer of the earth is
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 | ||
Mention the various types of rocks.
What is the mineral most commonly used in the following object?
What is the mineral most commonly used in the following object?
What is the mineral most commonly used in the following object?
Which one of the following is not a single element mineral?
