Sediments and sedimentary rocks are characterized by bedding, which occurs when layers of sediment ... The heavier sediment "squeezes" the water out of the underlying sediment due to its own weight.
Fine-grained sedimentary rocks, commonly referred to as "shale" or "mudstone", constitute approximately two thirds of the sedimentary column on Earth, and are nonetheless the least understood ...
A rock is an assemblage of mineral grains..... Each tetrahedron may be isolated from one another or they may be bonded together covalently by sharing oxygen atoms between adjacent tetrahedra. In this ...