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

Physics & Space Science

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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

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The Group 7A element astatine (85At) would be predicted to occur in what phase?

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Physics & Space Science

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.

Physics & Space Science