For her summer science internship, Jill has been tasked with gathering samples from the bottoms of various lakes and testing them. If a lake does not turn over, what will she MOST expect to find?
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Responses
low carbon dioxide levels
low carbon dioxide levels
high methane levels
high methane levels
low nutrient levels
low nutrient levels
high oxygen levels
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If a lake does not turn over, Jill would most expect to find high methane levels.
When a lake does not undergo turnover, the bottom layers become anoxic (low in oxygen), which can promote anaerobic decomposition processes. In these conditions, organic matter is broken down by bacteria that produce methane as a byproduct. Therefore, in a non-turning lake, the accumulation of organic material and lack of oxygen would lead to higher methane levels.
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