Answer:
High viscosity and lots of dissolved gas
There is a significant rain shadow effect east of the Rockies. One prime example is Denver. Over the course of a year it would typically receive ~20 inches of rain, but many locations to the west of the continental divide receive as much as 40 inches of rain a year. (It's important to note that the rain shadow effect only impacts storms and winds traveling against the mountains. If a storm travels south to north, the effect is severely diminished and can result in a situation where the lee side of the mountains receives more rainfall than the wind side of the mountains.
Basically physical and chemical weathering (do not confuse with erosion, which involves movement) contribute to the destruction of mineral forms. In this case it breaks down the rocks, minerals and soils, creating slopes and hills. It may be caused by (any form of) water, wind, gravity, waves or sunlight.
The population decays by a factor of (1/2 )^1/4 every hour.
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Exponential Function</h3>
An exponential function is in the form:
y = abˣ
Where a is the initial value of y, b is the multiplier, y and x are variables.
Let y represent the bacteria population after x hours.
A bacteria population decreases by a factor of 1/2 every 4 hours.

The population decays by a factor of (1/2 )^1/4 every hour.
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