What horizon is subsoil found in?

Poor farming practices, wind, and drought let to this event that took place in the 1930s?

What is the dark-colored substance that forms as plant and animal remains decay?

What do you call it when dead weeds and stalks of the previous year's crop are plowed into the ground to help return nutrients, retain moisture, and hold soil in place?

What do you call it when a farmer plants different crops in a field each year?

What do we call anything in the environment that humans can use?

What are the two most important factors that determine the rate at which weathering takes place?

Which of the following is NOT an example of mechanical weathering?

Which of the following is NOT an example of chemical weathering?

What do you call the process that breaks down rock through chemical changes?

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