Answer : 2. " sedimentary "
Explanation :

1. Sedimentary rocks are formed by sediment consolidation and compaction of sediments. Therefore, they are layered or stratified to different sizes. Examples: Sandstone, Shale, etc.

2. These types of rocks cover 75 per cent of the Earth's crust but occupy only 5 per cent (as they are available only in the upper part of the crust).

3. Coal is deposited in the river valleys of Damodar, Mahanadi, and Godavari in Gondwana sedimentary deposits.