Unit 2 - Lessons 1-3

Front

Earth has ______ major systems that interact with each other.

Back

2

Front

The air above the surface of the Earth is the _____________.

Back

atmosphere

Front

All living things are part of the _____________.

Back

biosphere

Front

All of the water on the Earth is part of the _____________.

Back

hydrosphere

Front

The ___________ is everything that includes the Earth's surface and its interior.

Back

geosphere

Front

There are many different gases in the air, and some of them make the Earth warmer as a result of the _____________ effect.

Back

greenhouse

Front

This system contains the least amount of material of Earth's four systems: hydrosphere, biosphere, atmosphere, geosphere.

Back

biosphere

Front

About ____ percent of the Earth's surface is covered with water.

Back

75%

Front

Of all of the water on Earth, _____ is saltwater.

Back

97%

Front

Precipitation in the water cycle includes ____________.

Back

rain, hail, snow, all of these