We cannot see tidal forces or tidal heating; rather, we predict that they must occur based on the orbital characteristics of the moons. What observational evidence confirms that tidal heating is important on Io?
a. Io's surprisingly elliptical orbit
b. active volcanoes on Io
c. Io's unusual, egg-like shape
d. the orbital resonance between Io, Europa, and Ganymede
Ans: b. active volcanoes on Io
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Assume that the average rate of 1-km sized asteroids hitting the Earth is about 1 every million years. The chance of the Earth being hit by a 1-km sized asteroid in the next 100 years is about:
A) one in ten thousand. B) one in a million. C) zero. D) one in 100 million. E) inevitable, it has to happen sometime.
Historians claim that mechanization (development of the cotton gin) was responsible for preservation of the institution of slavery in the American South
Discuss the possibility that they could be correct or incorrect, and try to find evidence to support your thesis.
What is the most common depositional feature created by the work of the oceans?
What will be an ideal response?
Resistance and Resistivity: What is the resistance of a cylindrical metal rod 1.0 cm in diameter and 45 m long, if the resistivity of the metal is 1.4 × 10-8 ? ? m?
A. 0.0063 ? B. 0.0080 ? C. 0.80 ? D. 6.3 ?