The extreme size of volcanoes on Mars indicates that
a. Mars has a much thicker crust than Earth.
b. water once flowed in streams on Mars.
c. large moving plates have not formed on Mars.
d. Mars has a much thicker crust than Earth and large moving plates have not formed on Mars.
e. Mars has a much thicker crust than Earth, water once flowed in streams on Mars, and large moving plates have not formed on Mars.
d
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Why are there fewer large craters on the seafloor than on the continents?
A) The seafloor crust is younger than the continental crust. B) The oceans slow large impactors and prevent them from making craters. C) The oceans erode away craters faster than erosion processes on land. D) Large impactors primarily strike land masses. E) Large impactors aim for life-forms such as dinosaurs.
A car weighing 5000 N is traveling along a straight level road powered by a forward drive force of 500 N. The force of air resistance is 200 N, and rolling resistance is 100 N. The net force on the car is
A) 200 N forward. B) zero. C) 300 N backward. D) 5000 N downward. E) 500 N forward.
The Group 7A element astatine (85At) would be predicted to occur in what phase?
a. Liquid b. Solid c. Plasma d. Gas
All real engines are less efficient than the Carnot engine because
a. they do not operate through the Otto cycle. b. they do not operate through a reversible cycle. c. the working substance does not maintain a constant volume through the cycle. d. the working substance does not maintain a constant pressure through the cycle. e. the working substance does not maintain a constant temperature through the cycle.