a deep valley with steep sides

A natural feature from a land's surface

the area of land that is around you.

something that is very old, from a time before history was recorded.

The top or highest part of a mountain.

a long narrow groove or ditch

living things that grow well and are healthy

something that is needed or is very important

something that controls itself

to control something from a distance

something that can go or work under water

a very quick look at something