What evidence made scientists hypothesize that dust contained calcium?
A) crystals found high on ridges
B) limestone formations on prairies
C) the color of dust on windswept plateaus
D) dissolved calcite in the ground
Correct Answer:
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Q35: Which factor would not cause a variation
Q36: Caliche is
A) fragmented quartz crystals that tumble
Q37: Choose the option that puts the soil
Q38: Comment on the accuracy and usefulness of
Q39: What event was a major factor in
Q41: _ soils in the southeastern U.S. are
Q42: _ soils in New England form in
Q43: How many metric tons of soil erode
Q44: What is a rill?
A) a scooped-out valley
Q45: _ soils are common in the equatorial
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