a natural structure on Earth's surface

the shaking of Earth's crust

the movement of sediments

a vent in the Earth's crust through which lava, steam, and ashes are expelled

small piece of weathered rock

a steep valley formed by weathering and erosion usually by water

the dropping off of sediments in a new place

a huge piece of ice

the sliding down of a mass of earth or rock from a

mountain or cliff

an area of low, flat land where a river splits and spreads

out into several branches before entering the sea

a low area of land between hills or mountains, typically

with a river or stream flowing through it

a mound, hill or ridge of sand that lies behind the

part of the beach affected by tides

A large rock typically one that has been worn

smoother by erosion