The oldest layer in this tilted sequence of sedimentary rocks is
A. the layers on the lower left part of the photograph.
B. at the top of the hill in the center of the photograph.
C. the darkest layer.
D. the layers on the right of the photograph.
Answer: A
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Judge the following sentence according to the criteria given below: Aluminum is concentrated in the
formation of bauxite ore BECAUSE it is relatively insoluble during the deep chemical weathering that occurs in hot, humid tropical climates. a. The assertion and reason are both correct, and the reason is valid. b. The assertion and reason are both correct, and the reason is invalid. c. The assertion is correct and the reason is incorrect. d. The assertion is incorrect and the reason is correct. e. Both the assertion and the reason are incorrect
The chemical union of oxygen with another substance to form a new product is called __________________
Fill in the blank(s) with correct word
Match the causes of soil erosion with the soil conservation practice intended to reduce that erosion.Wind velocity:
A. Keep soil covered B. Contour plowing C. Provide shelter for fields D. Return organic matter to soil