In the United States, the western slopes of the hills are usually more densely vegetated than the eastern ones. It happens that

In the United States, the western slopes of the hills are usually more densely vegetated than the eastern ones. It happens that the eastern slope is practically bare. Explain this phenomenon

In the United States, westerly winds mainly blow, driving humid air from the Pacific Ocean. Meeting the mountains, the air flow rises. This is an adiabatic (closed) process, since the system does not receive heat from the outside and does not give it away. It is known that in the mountains the pressure decreases with increasing altitude. As the air cools, it condenses drops of moisture, which falls in the form of rain on the western slope, which stimulates plant growth.

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