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18 Cards in this Set
- Front
- Back
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Fossil |
The trace or remains of something that lived long ago. |
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Fuel |
A material that is burned for energy. Wood and gasoline are examples of fuels. |
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Igneous rock |
A rock that forms when melted rock cools and hardens. |
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Metamorphic rock |
A kind of rock that has been changed by heating and squeezing. |
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Mineral |
A solid, nonliving substance found in nature. |
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Natural resource |
A material on Earth that is necessary or useful to people. Plants and soil are natural resources. |
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Pollution |
What happens when harmful materials get into water, air, or land. |
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Rock |
A nonliving material made one or more minerals. |
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Sediment |
Tiny bits of weathered rock or once-living animals and plants. |
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Sedimentary rock |
A kind of rock that forms from layers of sediment. |
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Soil |
A mixture of minerals, weathered rocks, and decayed plant and animal matter. |
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Conserve |
To use resources wisely. You conserve gasoline when you walk, ride a bicycle, or ride a bus instead of using a car. |
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Groundwater |
Water that is held in rocks and soil below the ground. |
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Pollution |
What happens when harmful materials get into water, air, or land. |
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Humus |
Decayed plant and animal material in soil. This makes soil look dark. |
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Nonrenewable resouce |
A resource that cannot be replaced or reused easily. Oil is a nonrenewable resource. Once it is used up, it is gone forever. |
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Renewable resource |
Can be replaced or used again and again. Wind is a renewable resource |
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Solar energy |
Energy from the sun. |
