Unit 3 lesson 3 grade 6

Front

What is the atmosphere?

Back

The gases that surround the Earth (close to Earth).

Front

What is biosphere?

Back

the living organisms (plants and animals) that occupy the surface, atmosphere and hydrosphere of the earth.

Front

What is hydrosphere?

Back

all the waters on the earth's surface (e.g., rivers, lakes, oceans)

Front

What is lithosphere?

Back

the hard, solid part of the earth (e.g., the soil and rock near the surface)

Front

What is pollution?

Back

materials that people put into the environment that can be harmful if there is too much (e.g., smog in air harmful chemicals in water)

Front

What is deforestation?

Back

the cutting down of forests

Front

What is dust bowl?

Back

a region in the U.S. where agricultural crops died during years when there was too little precipitation in the 1930's and winds blew away soil that was not covered by plants

Front

What is acid rain?

Back

rainfall that has such a high amount of acid that it harms forests; caused mainly by air that comes from places that burn coal that has high amounts of sulfur.

Front

What is smog?

Back

hazy air that contains smoke or particles or other pollutants.

Front

What is erosion?

Back

removal of soil or rock materials by the force of blowing wind or by the force of fowing water