Front

emissions

Back

pollutants released into the air

Front

smog

Back

mixture of smoke and fog

Front

point source

Back

single source of air pollution

Front

nonpoint source

Back

widespread sources of air pollution

Front

ozone

Back

a poisonous gas made of three oxygen atoms

Front

acid rain

Back

Chemical pollution in the air mixed with falling water.

Front

technology

Back

The way we apply science to daily life to meet our needs or solve problems.

Front

efficiency

Back

A way to make technology work better, with less waste of materials and time.

Front

erosion

Back

The breaking down and carrying away of particles of rock.

Front

sediment

Back

Particles of rock and clay that settle at the bottom of rivers and oceans.