1) greenhouse effect: This is another term for global warming.
2) acid rain: This type of precipitation is caused by pollution and is harmful to plants, animals, bodies of water, and buildings.
3) fuel: A type of potential energy that can be burned to supply heat, such as wood.
4) can: A metal container.
5) clean: To remove dirt or stains from something.
6) gasoline: A type of fuel used in cars with internal-combustion engines. This is made from petroleum.
7) watt: A unit of electric power, equal to one joule of work per second.
8) pollution : Harmful substances that are released and make our planet dirty, noisy, or unhealthy.
9) habitat: The place or type of environment where an animal or plant naturally lives or grows.
10) air: The invisible mixture of gases we breathe.
11) erosion: This occurs when running water, sea waves, wind, or glaciers pick up and carry away materials from the earth's surface.
12) oxygen: We must breathe this gas in the air to survive.
13) soil: This covers most of the earth's land, and is made up mostly of disintegrated rocks.
14) tree: A plant with leaves, roots, and a single, woody trunk.
15) industry: Manufacturing companies and other businesses.
16) radiation: Thermal energy that travels in waves and can pass through empty space as well as some objects.
17) conservation: The protection and more efficient use of natural resources.
18) water cycle: The constant recycling and movement of water on Earth. Energy from the sun, plants, or animals causes water to evaporate. The water vapor rises in the atmosphere to form clouds. Rain returns the water from clouds back to the earth's surface.
19) coal: A solid, hard black mineral that burns and gives off heat.
20) volunteer: A person who helps or offers to do something without getting paid.
21) rainforest: This ecosystem is hot and humid all year round. Chameleons, toucans, and chimpanzees all live here.
22) fossil fuel: A type of fuel formed from the remains of plants or sea creatures millions of years ago.
23) ocean: The large body of saltwater that covers about 70% of the earth's surface.
24) Earth: This is the third planet from the sun.
25) deforestation: The disappearance of forests due to land development, cultivation, or lumbering.
26) efficiency: Performing or functioning in the least wasteful manner possible.
27) electricity: A physical agency caused by the movement of electrons, protons, manifesting itself as attraction, replusion, magnetic, luminous, and heating effects.
28) trash: Any useless material that is thrown away.
29) fluorescent: An efficient type of light bulb.
30) litter: To throw garbage on the ground instead of in a garbage can.
31) hazardous: Potentially dangerous to human beings or the environment
32) hydroelectricity: Power derived from the fall of water from a higher to a lower level, and extracted by means of waterwheels or hydraulic turbines
33) Ozone layer: A layer in the atmosphere which blocks many of the sun's ultraviolet rays from reaching the earth.
34) global warming: The apparent rise in the earth's temperature that scientists believe is caused by an increase in the amount of carbon dioxide and other gases in the air.
35) renewable: Fuels that can generate power without being used up.
