The estimated average geothermal gradient in the mantle is:
a. 10?C/km.
b. 5?C/km.
c. 1?C/km.
d. -2?C/km.
e. -5?C/km.
C
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Which observation supports the theory that the planets formed from a disk shaped nebula?
A) The rocky planets are close to the Sun. B) Pluto and comets follow elliptical orbits that pass inside the orbit of Neptune. C) The planets revolve around the Sun in approximately the same plane of the ecliptic. D) The Sun is the center of the solar system.
Absolute space is
A) socioeconomic space. B) behavioral space. C) mathematical space. D) experiential/cultural space. E) both socioeconomic space and mathematical space.
If the satellite image shown in Figure 4.31 was taken during nighttime hours, it must be:
a. an infrared image.
b. a water vapor image.
c. a visible image.
d. none of the above
A north south oriented shoreline has land to the east and the major storm waves arrive from the southwest. A headland abuts westward along the shoreline and exposes a distinctive black basalt that is rapidly eroded by waves pounding the coast
Where would you expect to find black sand derived from this headland? A) immediately offshore of the headland B) on the beach to the south of the headland C) on the beach to the north of the headland D) only in pocket beaches along the headland