Venus's crust is thicker than Earth's because
A. Venus has little internal activity, keeping the crust from melting.
B. the high temperatures at the surface of Venus have baked the crust.
C. volcanic eruptions continuously add more material to the surface.
D. rocks on Venus melt at higher temperatures.
Answer: D
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One light-year (ly) is roughly _____
A) 1010 km B) 1011 km C) 1012 km D) 1013 km
List the terrestrial planets in decreasing order of their mass.
A. Venus, Earth, Mars, Mercury B. Mercury, Venus, Earth, Mars C. Mercury, Mars, Venus, Earth D. Earth, Venus, Mars, Mercury
Two astronauts, of masses 60. kg and 80. kg, are initially at rest in outer space. They push each other apart. What is their separation after the heavier astronaut has moved 12. m?
A) 21. m B) 24. m C) 16. m D) 9. m E) 28. m
Van der Waals bonding is due to
A) the transfer of electrons between atoms. B) atoms bonding to hydrogen molecules. C) unequal charge distribution around neutral molecules. D) the sharing of electrons between atoms.