The flow patterns found on the surface of Mars and the number of craters on top of them suggest that
a. Mars is today a liquid, water-rich world.
b. the climate on Mars was different billions of years ago.
c. volcanism is occurring on Mars.
d. the polar caps are made of liquid water.
e. All of the other choices are correct.
b
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The magnetic force on a point charge in a given magnetic field and at a given speed is largest when it
A. has velocity components both parallel to and perpendicular to the field. B. moves perpendicular to the magnetic field. C. moves in the direction opposite to the magnetic field. D. moves in the direction of the magnetic field.
What is the period (in hours) of a satellite circling Mars 100 km above the planet's surface? The mass of Mars is 6.42 × 1023 kg, its radius is 3.40 × 106 m, and G = 6.67 × 10-11 N ? m2/kg2
A) 1.75 h B) 1.25 h C) 1.15 h D) 1.00 h E) 1.45 h
Water loss through evaporation exceeds input for much of the land area of the United States
What will be an ideal response?
The lunar surface cools after the sun sets. This is an example of
a. heat conduction b. heat convection c. heat radiation d. thermal expansion e. none of the above