The dropping of sediment by wind or water is called?

Sediment deposited at the mouth of the river forms a _________

The slow breaking or wearing away of rock is __________

The preserved remains of a plant or animal that lived long ago is a ______

The uppermost layer of soil that contains humus is _________

The movement of rock material from one place to another is ________

The rocky layer beneath subsoil is ________

A very slow-moving mass of ice is a _______

Decayed remains of plants and animals in soil is _______