Sediment that is deposited at the mouth of a river makes the mouth of the river _______.

An area of sediment that builds up at the mouth of a river is called ______.

Two types of landforms are _______.

The layer of soil that contains humus is called ________.

The layer in which most plants grow is called _______.

The layer that is made of solid, unweathered rock under layers of soil is called ______.

Small bits of weathered rock and other material are called ______.

The moving of bits of weathered material from one place to another is called ______.

Soil is made of _______.

Three things than can cause rocks to weather are _____.

The three sizes of weathered rock found in soil are _______.

Two kinds of sudden erosion caused by gravity are _____.

_______ happens when water or wind gradually wears away rock by friction.

The process of water in and around rocks and soil freezing and expanding, breaking up the rocks, is called _______.

_____ is the rapid downhill movement of a large amount of soil and rocks.

A _______ is a huge sheet of ice that stays frozen all year.

An ______ is a sudden downhill movement of a large amount of snow and ice.

The process of breaking down rocks into smaller pieces is called _____.

True or false: Volcanoes and earthquakes can push land upward.

A moraine is a hill formed by a ______.

True or false: Decayed plant and animal material in soil is called sediment.

True or false: Erosion always happens quickly.

True or false: Glaciers can pick up sediment and rocks.

True or false: U-shaped valleys where ponds and lakes form can be caused by glaciers.