Atmosphere
The mixture of gases that surround a planet.
Hydrosphere
All of Earth’s water, taken together in all states of matter.
Geosphere
The solid portion of Earth including rocks, soil, mountains, and materials deep within Earth.
Biosphere
The system that includes all the living things on Earth.
Recycle
To use the materials in old things to make new things.
Green Technology
Innovative ways of using resources that minimize human impact on the environment.