Answer:
7 - a) a small river is called a <em>pond</em>
8 - b) fresh water conservation efforts
Answer:
The Great Oxidation Event (GOE), sometimes also called the Great Oxygenation Event, Oxygen Catastrophe, Oxygen Crisis, Oxygen Holocaust, or Oxygen Revolution, was a time period when the Earth's atmosphere and the shallow ocean experienced a rise in oxygen, approximately 2.4 billion years ago (2.4 Ga) to 2.1–2.0 Ga during the Paleoproterozoic era.
Explanation:
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The type of sand dune that would most likely form if the sand supply is limited the wind direction is constant and vegetation is sparse would be a barchan dunes. It is a <span>crescent-shaped sand </span>dune<span> produced by the action of wind predominately from one direction.</span>