Within the frost line, planetesimals were composed entirely of rock, and outside the frost line, planetesimals were composed entirely of ice
Indicate whether the statement is true or false
FALSE
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Electromagnetic waves of all wavelengths are collectively known as ________.
A. the electromagnetic spectrum B. the visible spectrum C. blackbody radiation D. white light E. a continuous spectrum
If you consider the total distance and total time for a trip, you are calculating a(an)
A. average speed B. constant speed C. instantaneous speed D. non-uniform speed
Most meteoroids--rocks moving through outer space--have been moving for billions of years. What, if anything, keeps them moving and why?
A) According to Newton's law of motion, their own acceleration keeps them moving. B) According to the law of inertia, nothing is needed to keep them moving. C) According to current theories about the creation of the universe, the big bang keeps them moving. D) According to Newton's law of gravity, the force of gravity keeps them moving. E) According to Newton's law of gravity, nothing is needed to keep them moving.
How come birds can land on overhead power lines without getting electrocuted?
a. Their feet are good insulators. b. They are saved by their small size. c. Both their feet are on the same wire, so they don't complete a circuit. d. They are just lucky, I guess.