Kim4Allensam8illywhi, The Colombian River is the river that flows along the border of Washington and Oregon. <span />
I find that the best answer is the following one:
c. determined by factors outside our control
For example, even though life is very hard in the very hot and the very cold regions, we can't control it: so this is an example of a physical environment that is hard to control.
In comparison, it is often easier to describe than our social environment.
Answer:
It is thicker below mountains than in valleys.
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Answer: A
Explination: The moon is tidally locked to the Earth because it rotates in exactly the same time as it takes to orbit the Earth. That is also why we only see one side of the moon.
