It's a fungus of the genus Coccidioides. Often the species is Coccidioides immitis. You can get valley fever (aka coccidioiomycosis) if you inhale it. People often get it after inhaling dust kicked up during plowing, or other soil disturbance.
Yes, valleys can cause erosion. The flow of water through valleys can carve out the land, carrying away soil and rock particles. Additionally, glaciers moving through valleys can also contribute to erosion by grinding and transporting material.
The rich soil in the Central Valley region comes from its history as a former lake bed and the accumulation of sediment over time. The fertile soil is also replenished by the annual flooding and irrigation of the area.
The soil on a valley floor would typically be better developed because it receives more sediment and nutrients from erosion of the surrounding hillsides and has more stable conditions for organic matter accumulation. In contrast, the soil on a hillside is more prone to erosion and tends to be shallower and less developed.
Floods can cause land degradation by eroding topsoil, carrying away nutrients, and saturating the soil with water which can lead to soil compaction and loss of soil structure. Droughts can cause land degradation by reducing vegetation cover, making the soil vulnerable to erosion, and depleting soil moisture, which can lead to desertification and loss of fertility in the soil.
Some of the world's most fertile soil is found near river valleys, such as the Nile River Valley in Egypt and the Ganges River Valley in India. These areas benefit from regular flooding, which replenishes the soil with nutrients and organic matter, making them ideal for agriculture.
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fertile soil is found here.
Moving water forms a valley be eroding the soil underneath it. As the water moves across the soil it takes some with it, this can form a valley over millions of years.
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The fertile soil from the Sierra Nevada mountains is washed down to the Central Valley of California by the rivers flowing from the mountains, such as the Sacramento and San Joaquin rivers. This deposition of soil has contributed to the agricultural productivity of the Central Valley.
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