Some nutrients are biologically active. Photosynthesis only occurs at the surface. Therefor,
a) nutrients deplete with depth
b) nutrients deplete at the surface
c) nutrients stay the samef
Answer: b) nutrients deplete at the surface
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________ and ________ are the two drinking water contaminants thought to pose an immediate health threat
Fill in the blank(s) with correct word
The vertical profile of which of the following factors is the basis of the division of the Earth's atmosphere into layers?
A. air pressure B. wind speed C. air temperature D. air density
Moving away from fossil fuels will remove 200 billion tons carbon from our atmosphere over the next 15 years.
Answer the following statement true (T) or false (F)
When cities dumped sewage into natural waterways with limited capacity for dilution,
A) oxygen levels were severely lowered and most aquatic life died. B) the extra organic matter fertilized the region, which quickly filled in with new plants. C) the extra organic matter created fertile areas that attracted wildlife including migratory birds. D) bacterial growth greatly increased and the sewage was safely recycled into soil.