In a freshwater river or stream, clearly explain what causes an oxygen sag curve and how this can impact natural populations in that ecosystem
What will be an ideal response
If there are high quantities of organic materials added into a body of water, these materials will be broken down by bacteria. This process can deplete dissolved oxygen in a region of a river, creating an oxygen sag curve. This can reduce or eliminate populations of organisms with high oxygen requirements. The depletion of oxygen could also be caused by the addition of thermal pollution.
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Which of the following is a natural factor that doesn't affect Earth's climate?
A) Changes in solar energy B) Reversed magnetic polarity C) Tectonic plate movement D) Variations in Earth's orbit E) Volcanic eruptions
In which region of the world would you expect irrigation to be most critical?
A) Rainfall is high. B) PET is equal to rainfall. C) PET is lower than rainfall. D) PET is higher than rainfall. E) Rainfall is low.
This signal is consistently transmitted by shopping malls to all, regardless of gender, age, class, or race
A) Appreciate architecture B) Consume, consume C) Observe social standards of behavior D) Buy low, sell high
This water balance diagram below suggests that
A) the location is in the Southern Hemisphere.
B) winters are snowy.
C) long periods of drought are common.
D) All of these are correct.