Which of the following best describes the geological histories of the Moon and Mercury?
A) Impact cratering is the only major geological process that has affected their surfaces.
B) All four geological processes were important in their early histories, but only impact cratering still reshapes their surfaces today.
C) Impact cratering shaped these worlds early in their histories. Then, during the past few million years, they were reshaped by episodes of volcanism and tectonics.
D) Early in their histories, they suffered many impacts and experienced some volcanism and tectonics, but they now have little geological activity at all.
D
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Faraday's Law: A constant uniform magnetic field of 0.50 T is applied at right angles to the plane of a flat rectangular loop of area 3.0 × 10-3 m2. If the area of this loop changes steadily from its original value to a new value of 1.6 × 10-3 m2 in 1.6 s, what is the emf induced in the loop?
A. 1.6 × 10-2 V B. 0 V C. 7.5 × 10-2 V D. 4.4 × 10-4 V E. 9.0 × 10-2 V
The main difference between a fog and a cloud is
A) water vapor content. B) density of vapor. C) seeding. D) altitude. E) temperature.
Due to its elliptical orbit, Mars is farther from the Sun on average during summer in the Northern Hemisphere. This means Northern Summer on Mars will be
A) long and mild B) short and hot C) long and hot D) short and mild
Many of the extrasolar planets that have been detected directly to date are
A) very large and at great distances from their parent star B) small and at great distances from their parent star C) small and close to their parent star D) very large and close to their parent star