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Mercury's smooth plains are probably the ____________parts of its crust.
Q1: The energy source at the center of
Q5: If H equals 50 km/sec/Mpc,then a galaxy
Q8: The passing star mechanism of the origin
Q11: If the gravitating matter density of the
Q13: The diagram below is a plot of
Q21: The center of our galaxy lies in
Q31: The size of the volcanoes on Mars
Q37: Uranus' moon,Ariel,has a bright surface and grooves
Q86: Which of the following is NOT a
Q99: Which of the following prescription and nonprescription