The geologist Harry Hess proposed the theory of
a. plate tectonics.
b. continental drift.
c. seafloor spreading.
d. mountain building.
c
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From the fact that virtually every galaxy is moving away from us and more distant galaxies are moving away from us at a faster rate than closer ones, we conclude that
A) the Milky Way Galaxy is expanding. B) we are located at the center of the universe. C) even nearby galaxies will eventually be moving faster than the speed of light. D) the universe is expanding. E) the universe is shrinking.
The precision and number of significant figures in 1.003 km is
A. precision = .0001 km, significant figure = 4. B. precision = .001 km, significant figure = 4. C. precision = .0001 km, significant figure = 3. D. precision = .001 km, significant figure = 3. E. precision = .0001 km, significant figure = 2.
The value of the magnetic field for a certain type of electromagnetic wave is 2.12 ?T. What is the value of the electric field for that wave?
A) 636 V/m B) 636 N/C C) 636 J/Cm D) All of the answers given are correct. E) None of the answers given is correct.