Which of the following is not one of Latin America's best farming areas?
A. alluvial soils along the Amazon River
B. pampas of Uruguay and Argentina
C. lava-based soils in southern Brazil
D. eastern plateaus
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As one approaches the poles, the Sun angle ________ and atmosphere attenuation ________.
A) increases; increases B) decreases; decreases C) increases; decreases D) decreases; increases
If the path of polar wandering recorded on two continents is not the same, then we can say that
A) Earth's magnetic history has been very complex. B) at least one of the continents has moved. C) our radioactive dating techniques have been inaccurate. D) the continents have always been widely separated.
Eventually our sun will become a red giant. Explain what this means. What would happen to Earth and our universe if this were to happen?
Among the following radioactive parent isotopes, which has the shortest half-life?
A) uranium-238 B) potassium-40 C) rubidium-87 D) carbon-14