Which forms of light are lower in energy and frequency than the light that our eyes can see?
A) infrared and radio
B) ultraviolet and X-rays
C) visible light
D) infrared and ultraviolet
A
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What future awaits Triton, the largest satellite of Neptune?
a. Tidal break-up as it spirals closer to Neptune b. Escape from Neptune after billions of years, as Triton gradually spirals outward c. Gravitational capture by Pluto d. Probable destruction from impact by Pluto
Classify the following changes as physical or chemical. Wood burns to ashes; water begins to boil; grass grows; a rock is crushed to powder
A) chemical; physical; chemical; chemical B) chemical; physical; physical; physical C) physical; physical; chemical; physical D) chemical; physical; chemical; physical
If the acceleration vector of an object is directed parallel to the velocity vector, then
A) the object is speeding up. B) the object is slowing down. C) the object is moving with a constant velocity. D) the object is turning. E) the object is at rest.
About what percent of Earth's radius do the crust and mantle together constitute?
a. 15% b. 70% c. 45% d. 30%