How did Alfred Wegener first notice the possibility of plate tectonics? What lies in the gap he noted?
What will be an ideal response?
He found that the western coast of Africa was an almost perfect fit for the eastern coast of South America. We now know the Mid-Atlantic Rift sits between them and its expansion is causing them to continue separating with time.
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The first small solid grains or flakes formed in our solar system by the process of ____________, the addition of material to an object an atom or molecule at a time
a. accretion b. sublimation c. hydration d. condensation e. vaporization
You push a heavy crate down a ramp at a constant velocity. Only four forces act on the crate. Which force does the greatest magnitude of work on the crate?
(a) The force of friction. (b) The force of gravity. (c) The normal force. (d) The force of you pushing. (e) The net force.
A fast train approaches a car waiting at a grade crossing and sounds its horn. A person in the car will notice that, compared to what it would be if the train were at rest, the horn sound's
A. frequency appears to be lower. B. wavelength appears to be longer. C. wavelength appears to be the same. D. frequency appears to be higher.
According to the definition of “science” given in this chapter, which of the following do you think are sciences? Choose the letter of the first discipline on the list that you think is not a science. (The answer is open to debate!)
A. Geology B. Psychology C. Economics D. Anthropology E. Political Science F. Philosophy T. All are sciences