Earth Day Theme Unit
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Name _____________________________
Date ___________________
  Earth Day
Select the definition that most nearly defines the given word.
Sample
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1.   photosynthesis
  A glass or plastic container which is normally used for storing liquid.
  The process by which plant cells use light, water, and carbon dioxide to make food.
  This term is used to describe species of animals or plants that no longer exist on Earth. Reasons for their disappearance include pollution, over-hunting, or climate changes. For example, the last member of the dodo bird, found only on the island of Mauritius, was killed around 1681.
  Any useless material that is thrown away.
2.   electricity
  A form of energy that is used in homes and is produced by the movement of electrons.
  A plant with leaves, roots, and a single, woody trunk.
  A solid, hard black mineral that burns and gives off heat. It's formed from partly decayed vegetable matter that's under great pressure and heat in the earth.
  This covers most of the earth's land, and is made up mostly of disintegrated rocks.
3.   acid rain
  Thermal energy that travels in waves and can pass through empty space as well as some objects.
  This type of precipitation is caused by pollution and is harmful to plants, animals, bodies of water, and buildings.
  The ability to cause a change in matter.
  A form of energy that is used in homes and is produced by the movement of electrons.
4.   nonrenewable
  Fossil fuels are ____ resources because they can only be used once.
  This type of precipitation is caused by pollution and is harmful to plants, animals, bodies of water, and buildings.
  Trees absorb this gas in the air and produce oxygen. This gas is harmful to our health.
  This is another term for global warming.
5.   bottles
  The amount of work a machine does compared to the amount of energy needed to run the machine.
  The large body of saltwater that covers about 70% of the earth's surface.
  To remove dirt or stains from something.
  A glass or plastic container which is normally used for storing liquid.
6.   soil
  This covers most of the earth's land, and is made up mostly of disintegrated rocks.
  The protection and more efficient use of natural resources.
  The process by which plant cells use light, water, and carbon dioxide to make food.
  A living creature that can breathe and move about.
7.   habitat
  The place or type of environment where an animal or plant naturally lives or grows.
  To try to keep or maintain something in its original form.
  This occurs when running water, sea waves, wind, or glaciers pick up and carry away materials from the earth's surface.
  This is the third planet from the sun.
8.   erosion
  This occurs when running water, sea waves, wind, or glaciers pick up and carry away materials from the earth's surface.
  We use this term to describe the disappearance of forests due to land development, cultivation, or lumbering.
  A person who helps or offers to do something without getting paid.
  This is an agricultural method that rainforest farmers use. They burn the forest to clear an area where they can grow plants.
9.   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.
  Fossil fuels are ____ resources because they can only be used once.
  Manufacturing companies and other businesses.
  To throw garbage on the ground instead of in a garbage can.
10.   conservation
  A type of potential energy that can be burned to supply heat, such as wood.
  The protection and more efficient use of natural resources.
  A type of fuel used in cars with internal-combustion engines. This is made from petroleum.
  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.
11.   Earth
  Any useless material that is thrown away.
  This is the third planet from the sun.
  Manufacturing companies and other businesses.
  This covers most of the earth's land, and is made up mostly of disintegrated rocks.
12.   deforestation
  We use this term to describe the disappearance of forests due to land development, cultivation, or lumbering.
  Trees absorb this gas in the air and produce oxygen. This gas is harmful to our health.
  A solid, hard black mineral that burns and gives off heat. It's formed from partly decayed vegetable matter that's under great pressure and heat in the earth.
  The amount of work a machine does compared to the amount of energy needed to run the machine.