Carefully examine the relative positions of the lettered arrows on the timeline below and estimate the ages represented by each arrow. Use the chart to answer this question.Which represents the oldest known rocks?

A. A
B. B
C. C
D. D
E. E
F. F


Answer: E

Environmental & Atmospheric Sciences

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Desertification contributes to the loss of agricultural land

Indicate whether this statement is true or false

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What enhances the ocean's buffering capacity?

A) The amount of dissolved inorganic carbon present B) The amount of acid already present in the ocean C) The amount of dissolved organic compounds D) None of these choices

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Which of the following methods are used to measure ocean surface currents indirectly?

A) Accidental spills from container ships B) Doppler flow meters C) Free-drifting Argo floats D) Propeller flow meters E) Radio-transmitting float bottles

Environmental & Atmospheric Sciences

Ionic bonds commonly are stronger than covalent bonds. Indicate whether the statement is true or false

Environmental & Atmospheric Sciences