23) Based on our current theory of Earth's formation, the water we drink comes from
A) ice that condensed in the solar nebula in the region where Earth formed.
B) chemical reactions that occurred in Earth's crust after Earth formed.
C) chemical reactions that occurred in Earth's core after Earth formed.
D) material left behind during the giant impact that formed the Moon.
E) comets that impacted Earth.
Answer: E
24) The heavy bombardment phase of the solar system lasted
A) several million years.
B) several tens of millions of years.
C) several hundreds of millions of years.
D) about a billion years.
E) to the present time.
Answer: C
25) Which of the following is not evidence supporting the giant impact theory for the formation of the Moon?
A) Computer simulations show that the Moon could really have formed in this way.
B) The composition of the Moon is similar to that of Earth's outer layers.
C) The Moon is depleted of easily vaporized materials, as we would expect from the heat of an impact.
D) Scientists have found several meteorites that appear to be the remains of the object that caused the giant impact.
E) We see signatures of giant impacts on other planets.
Answer: D
26) Which of the following puzzles in the solar system cannot be explained by a giant impact event?
A) the formation of the Moon
B) the large metallic core of Mercury
C) the backward rotation of Venus
D) the extreme axis tilt of Uranus
E) the orbit of Triton in the opposite direction to Neptune's rotation
Answer: E
27) The nebular theory of the formation of the solar system successfully predicts all but one of the following. Which one does the theory not predict?
A) Planets orbit around the Sun in nearly circular orbits in a flattened disk.
B) the compositional differences between the terrestrial and jovian planets
C) the equal number of terrestrial and jovian planets
D) asteroids, Kuiper-belt comets, and the Oort cloud
E) the craters on the Moon
Answer: C
No comments:
Post a Comment