Front

Farming that produces just enough food for a family.

Back

Subsistence farming

Front

A split, break, or breach

Back

rift

Front

A long period without rain

Back

Drought

Front

A mixture of rich soil and tiny rocks

Back

silt

Front

to supply water to

Back

irrigate

Front

Small area in a desert with water and vegetation

Back

Oasis

Front

A stream or river flowing into a larger river

Back

tributary

Front

A person who moves from place to place

Back

nomad

Front

A group of ecosystems sharing similar climates and organisms

Back

biome

Front

System for producing and distributing goods/services to meet wants

Back

economy