Which terrestrial planet is the least dense?
A. Mercury
B. Mars
C. Earth
D. Venus
Answer: B
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How often do objects big enough to create craters like Meteor Crater impact Earth?
A) once in Earth's history B) about once every ten thousand years C) about once every few million years D) about once every day, but most burn up in the atmosphere or land in the ocean
Which of the following hypothetical observations would demonstrate that the inflation model was incorrect?
A) The geometry of the universe is curved, not flat. B) The helium abundance in a galaxy is 29%. C) The rate of expansion of the universe has changed over time. D) Stars began to shine only a few hundred million years after the Big Bang.
If you do an experiment on Earth, and then do an identical experiment in a jet plane moving uniformly at a high speed, you get identical results from both experiments. This is an example of __________
Fill in the blank(s) with correct word
Action-reaction forces are
A) equal in magnitude and point in the same direction. B) equal in magnitude but point in opposite directions. C) unequal in magnitude but point in the same direction. D) unequal in magnitude and point in opposite directions