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1
During ______, water moves from the atmosphere
to the land and ocean.
1
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Precipitation
2
All biological molecules contain what element?
2
Carbon
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3
The combustion of coal, oil and natural gas is part
of the _______ cycle.
3
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Carbon
4
The development of a community on bare, exposed
rock is an example of ______.
4
Primary succession
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5
Water changes from a liquid to a vapor during
_____.
5
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Evaporation
6
During nitrogen fixation, nitrogen gas is converted
into a form that _____ can use.
6
Plants
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7
Bacteria are essential to what cycle?
7
Nitogen
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8
The pioneer species that appears on bare rock is
usually what?
8
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Lichens
9
If a farmer lets a field go, what type of
succession is occurring?
9
Succession
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