Earth's internal layers were discovered by studying the movement of P- and S- waves through Earth's interior. In comparison to S-waves, the movement of P-waves is
A) fast, compressing and expanding the rock as they move through it.
B) fast, vibrating the rock particles up and down and side-to-side.
C) slower and can travel through solid granite, magma, water or air.
D) slower and can travel only through solids, not liquids.
Answer: A
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Photons of blue light
a. have a greater energy than photons of red light. b. have a greater energy than photons of ultraviolet light. c. have a lower frequency than photons of red light. d. have a longer wavelength than photons of red light. e. travel at a greater speed than photons of red light.
_____________ do not have enough mass to sustain nuclear fusion in its core but are more massive than planets
Fill in the blank(s) with correct word
Besides Earth, which terrestrial planet also has seasons?
A. Mercury B. Mars C. Venus D. Seasons are unique to Earth.
A ball is projected upward at time t = 0 s, from a point on a flat roof 10 m above the ground. The ball rises and then falls with insignificant air resistance, missing the roof, and strikes the ground
The initial velocity of the ball is Consider all quantities as positive in the upward direction. At time the vertical velocity of the ball is closest to A) 0 m/s. B) +175 m/s. C) +12 m/s. D) -175 m/s. E) -12 m/s.