Olympus Mons, at 600 km across, is the largest volcano
A. in the solar system.
B. on Europa.
C. on Earth.
D. on Jupiter.
Answer: A
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Within Earth's mantle, convection cells move lithospheric plates toward ____ and away from ____
a. spreading centers; subduction zones b. subduction zones; spreading centers c. subduction zones; continental crust d. spreading centers; hot spots e. hot spots; spreading centers
Which mechanism generates Earth's magnetic field?
a. The very thin crust b. The rocky upper mantle c. The circulation of the outer core d. The stable inner core
The western United States has
A) low-density mantle that extends extraordinarily deep. B) high-density mantle very close to the surface. C) low-density mantle close to the surface. D) high-density mantle that extends very deep.
Present atmospheric methane (CH4 ) concentrations are at approximately________ ppb
A) 750 B) 1000 C) 1500 D) 1800