4.
Intrusive rocks are

7.
The low-lying lands where the water table has reached the land surface and which commonly occur along food plains of rivers and in low lying sea-shores. Such areas are known as

8.
It is more or less parallel sided vertical wall of igneous rock formed due to upward intrusion of molten magma through fissures or cracks and is a common occurrence in coalfields. Guess it as

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