Which of the following are correct 1 Extrusive igneous rocks are called as plutonic rocks ...........

Geography Earth Geology

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Which of the following are correct?

1.Extrusive igneous rocks are called as plutonic rocks

2. Intrusive rocks are fine grained than the extrusive rocks

3.Siliceous rocks are basic in nature

4.Igneous rocks are hard, compact, free of fossile and layered

Select the correct answer from the codes given below:

1, 2, 3 and 4

1, 2 and 3

1 and 2

none of these

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Explanation:

1. Plutonic rocks are intrusive rocks. They are formed when molten matter is not able to reach the surface and instead cools down very slowly at great depths.

2. Intrusive rocks are not fine grained. Slow cooling allows big-sized crystals (large grains) to be formed in intrusive rocks.

3. Siliceous rocks are acidic in nature.

4. Based on place and time taken in cooling of the molten matter, igneous rocks can be divided into Plutonic and Volcanic rocks. Plutonic are compact and hard and volcanic are fine grained.