<span><span>Porosity is the amount of empty space in a rock or other earth material (like sand) - in other words, it's how much water a material can hold.
Permeability refers to how well water flows through a material - the flow is controlled by how large the pores are and how well connected the pores are in a given object.</span><span>Therefore, there these are two primary factors that limit the movement and the amount of water (or other fluids) retained in rocks/sedimentary materials.</span></span>
Without a table or graph, you might forget what an equation represents.
The rain shadow of several mountain ranges, chiefly the Sierra Nevada Mountains and the Rocky Mountains, keeps Western North America much drier than the humid locations of Eastern North America, which are more often affected by moist air from the Gulf of Mexico and the Atlantic Ocean.
Moisture condenses at high altitude, leaving air masses arid or semi-arid after passing over mountain ranges. You will see this in regional climate patterns in the U.S. The Central Valley of California and the Mojave Desert are both relatively dry as they are in the rain shadow of the Coast Ranges. The Great Basin is extremely dry, too, as it sits in the rain shadow of the Sierra Nevada Mountains. Even the Great Plains see higher aridity due to the Rocky Mountains to the west, resulting in long dry stretches throughout the year.
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Answer:
it was called Forum i think
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