Condensation of the water vapor by degassing magma during the time following Earth's formation produced the ________.
A. biosphere
B. magnetosphere
C. atmosphere
D. hydrosphere
E. geosphere
Answer: D
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A geosynchronous communication satellite hovers above the same point on Earth's equator indefinitely because
A. its orbital period is 24 hours. B. it is beyond the main pull of Earth gravity. C. it is kept aloft by ground control. D. forces other than Earth's gravity act on it.
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
Lighter elements (atomic number less than 5) were created by:
a) Accretion during nebula formation b) Nuclear fusion during or right after the Big Bang c) Nuclear fusion within earliest stars d) Nuclear fusion during supernova e) Nuclear fission within stars
As surface air rushes in toward the eye of a hurricane, the air expands and should cool. The main reason the surface air is not cooler around the eye is because ____
A) the sinking air near the eye warms the air B) friction with the water adds heat to the air C) the warm water heats the air D) sunlight heats the air