One reason the planets near the Sun are composed mainly of rock and iron may be that
A. the Sun is made mostly of iron, so the planets nearest it are formed of iron.
B. the Sun's heat made it difficult for ices and gases to condense near it.
C. the Sun's gravity sucked in iron and heavy material and the lighter materials floated farther away.
D. the Sun's magnetic field attracted all the iron into the region around the Sun.
Answer: B
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Where was supernova 1987a located?
A) in the Orion Nebula, M-42 B) in Sagittarius, near the Galactic Nucleus C) in our companion galaxy, the Large Magellanic Cloud D) in M-13, one of the closest of the evolved globular clusters E) near the core of M-31, the Andromeda Galaxy
The interior of Earth is very hot because of ________.
A. the radioactive decay of elements B. internal combustion C. oxidation D. fusion reactions
What is created by the fusion of three helium nuclei?
B) oxygen C) carbon D) nitrogen E) iron
Assuming the impact hypothesis is correct, in what way(s) was the impact important to our existence on Earth today?
A. Water from the impact-generated tsunami explains why regions of North America are agriculturally fertile today. B. The iridium and other metals brought to Earth by the impact have proven to be very important for modern electronic devices. C. Prior to the impact, early humans had been threatened by dinosaurs, but after the impact they were free to develop civlization. D. It seems unlike that we would have evolved by now without the extinctions caused by the impact.