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Actions by one thing that has an effect on a different or separate thing.

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A small body of fresh water that flows into a river.

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The science, art, and business of cultivating soil, producing crops, and raising livestock.

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The part of Earth's surface that is not covered by water, as opposed to the sea or the air.

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All the plants found in a particular area.

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The entire body of salt water that covers about 71% of the Earth.

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Something valuable that we can use.

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All the interacting populations in a particular area.

True or False

Sometimes humans take and use too much fresh water from the environment, which can cause organisms to die.

Problem or solution?

Using a push mower is a ________ to air pollution.

Humans have _______ fresh water by dumping trash or wastes into them.

True or False

Only certain people have the responsibility to care for the Earth.

Landfills cover _______ of acres of land.

Problem or solution?

Using cold water instead of hot water is a ________ to air pollution.

What kind of pollution cannot be seen, touched, smelled, or tasted.

True or False

Trees help increase erosion by reducing rainwater runoff.

One large tree can give off enough oxygen for ____ people to breathe for one day.

Problem or solution?

Making several trips to the store is a _________ to air pollution.

Scientists believe that humans destroy at least one acre of rain forest every ___.