In tropical regions, coasts can be modified by biological activity such as the construction of ____________
____________, which are linear masses of calcium carbonate assembled from and by multitudes of coral animals Fill in the blank(s) with the appropriate word(s).
coral reefs
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It is difficult to find an esker on a present-day landscape because
A) they were formed by glaciers only in very rare conditions. B) they erode naturally very quickly. C) they are usually overlain by other sediments from modern streams. D) humans mine them as a source of gravel.
What percent of the world's power is generated from renewable sources?
A) 20% B) 10% C) 3% D) 5% E) 7%
Ghana is also endowed with one of the world's largest artificial lakes, Lake ________
A) Victoria B) Malawi C) Nyassa D) Volta
Groundwater does not move at all.
Answer the following statement true (T) or false (F)