Front

beach

Back

land next to a large area of water, often covered in sand.

Front

boulder

Back

a large rock.

Front

downstream

Back

toward the direction that water in a river or stream flows.

Front

erosion

Back

when tiny bits of rock are moved from one place to another.

Front

flow

Back

to move along.

Front

microscope

Back

A tool used to see very tiny things up close.

Front

model

Back

A pretend version of something that scientists use when the real thing is too big, small, or complicated to work with.

Front

mountain

Back

a high area of land with steep sides.

Front

ocean

Back

a large area of salt water that covers the Earth.

Front

pebble

Back

a small rock, usually with smooth edges.