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3
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mountains that form as continental crust crumble and bend into folds
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4
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magma that has reached Earth's surface
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5
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the idea that Earth is always changing, the same forces of change are at work today and at work in the past
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6
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traces or remains of living things from long ago
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7
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actual age of an event or object
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8
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divides Earth's history into intervals of time defined by major events or changes on Earth
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12
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fossils that are the actual bodies or body parts of organisms
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14
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fossils of organisms that were common, lived in many areas and existed only during specific spans of time
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15
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dense cloud of super hot gases and rock fragments that races down hill
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17
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a rapid downhill movement of rock and soil
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18
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a tubular sample that shows the layers of snow and ice that have built up over thousands of years
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19
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water that shoots into the air
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