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A geologic age is a subdivision of geologic time that divides an epoch into smaller parts. A succession of rock strata laid down in a single age on the geologic timescale is a stage .
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The ecological effects of acid rain are most clearly seen in aquatic environments, such as streams, lakes, and marshes where it can be harmful to fish and other wildlife. As it flows through the soil, acidic rain water can leach aluminum from soil clay particles and then flow into streams and lakes.
Gondwana<span> was an ancient supercontinent that broke up about 180 million years ago.</span>
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Plants and bacteria are two other major biotic components of the Great Barrier Reef. Bacteria act as decomposers for this ecosystem, and they break down dead organic matter and convert it into energy that can be used by other living things in the ecosystem.