The Human world lesson 4- modifications of the environment

• terrace farming

• slash and burn farming

• slash and burn farming

• terrace farming

• center pivot irrigation

• terrace farming

• slash and burn farming

• fracking

• central pivot irrigation

People create problems for the environment

• pollution

• deforestation

• acid rains

• land erosion

• reforestation

Protects earth from UV

• ozone layer

• nitrogen layer

People change environment by

• building roads, bridges, and dams

• clear land for farming and housing

• dig to get resources for fuel

• water cicle

Process that breaks down by injecting large amount of water and chemicals into cracks.

• fracking

• cracking

People support fracking because it

• supplies oil and natural gas

• hurt environment andpollutes water

Many people oppose fracking

• hurt environment andpollutes water

• gives oil and gas