The presence of breccias among the lunar rock samples shows that
a. volcanism did not occur on the moon.
b. molten lava once flowed over the lunar surface.
c. the crust must have been made of anorthosite.
d. water once existed on the moon in the form of small lakes and streams.
e. the lunar surface was fragmented by meteorite impacts.
E
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If stars existed but galaxies did not:
A. We would probably still exist anyway. B. We would not exist because life on Earth depends on the light produced by galaxies. C. We would not exist because we are made of material that required recycling in galaxies.
About how old is Earth?
a. 6000 years b. 1 million years c. 1 billion years d. 5 billion years e. 14 billion years
In terms of its thick and chemically active atmosphere of hydrocarbons, which jovian moon was visited by the Huygens probe in 2005?
A) Europa B) Triton C) Titan D) Titania E) Enceladus
An amount of water forms a single hexagonally symmetric snowflake. Elsewhere the same amount of water is a droplet of liquid water. Which state has higher entropy?
A. The solid water, since it has a tight restriction to hexagonal symmetry B. The droplet of liquid water, since it is more unruly and can adopt almost any shape C. Their entropy levels are the same, since they are actually the same amount of H2O, just different phases