What drives the high-speed winds in Venus's atmosphere?
A. light from the Sun in its equatorial regions
B. cold temperatures at the poles
C. a polar vortex
D. the slow spin of the planet
Answer: A
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A group of eras are called a(n)
a. eon. b. period. c. millennia. d. epoch.
When an atom of sodium in the surface of the sun has two electrons removed, then
A. it becomes aluminum. B. it is a positive ion susceptible to acceleration in solar magnetic fields. C. it has a negative charge. D. it is a negatively charged rubidium atom.
Photon Energy: Increasing the brightness of a beam of light without changing its color will increase
A. the number of photons per second traveling in the beam. B. the energy of each photon. C. the speed of the photons. D. the frequency of the light. E. the wavelength of the photons.
In Ptolemy's theory,
A) the planets move in circles-within-circles around the sun. B) the planets move in elliptical orbits around the sun. C) the planets move in circles around Earth. D) the planets move in circles around the sun. E) the planets move in circles-within-circles ["loop-the -loops"] around Earth.