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Prairie soils are usually ash-gray in color.
Q5: The positive interaction between species that is
Q27: Since humans took up agriculture, the Earth's
Q37: In the figure below, the Mississippi River
Q47: Organisms that ingest other organisms as their
Q55: Sometimes rocks are grooved and polished by
Q55: Pieces of ice that break off of
Q60: The most recent glaciation in North America
Q60: The breakdown of carbohydrates combined with oxygen
Q116: The accompanying table below shows the relationship
Q129: The colors of soils in dry climates