Rovers sent to Mars have discovered
A) minerals in Martian rocks that can only form in liquid water.
B) clear evidence that life once existed on Mars.
C) Mars has more craters than previously thought.
D) small pockets of liquid water lying just beneath the Martian soil.
A) minerals in Martian rocks that can only form in liquid water.
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The chef at the infamous Fattening Tower of Pizza tosses a spinning disk of uncooked pizza dough into the air. The disk becomes wider during its flight, while its rotational speed
A) remains constant. B) quickens. C) slows.
What happened in the Planck Era? At what temperature did it end?
What will be an ideal response?
Vision Problems: Without glasses, a person can comfortably read a magazine when it is held at 60 cm from his eyes. What should be the focal length of his contact lenses to allow him to read the magazine comfortably at a distance of 30 cm?
A. -30 cm B. +30 cm C. -60 cm D. +60 cm E. +90 cm
Which travels with the greatest speed in a vacuum?
A) radio waves B) light waves C) X-rays D) gamma rays E) all have the same speed