Lesson 7&8 from Assignment Flashcards
Where did the elements heavier than hydrogen and helium come from?
a) They were produced in the Big Bang.
b) They evolved from hydrogen and helium shortly after the Big Bang.
c) They were produced inside stars.
d) They were produced inside dense interstellar gas.
all of the mentioned choices
c (they were produced inside stars)
Where are most of the known asteroids found?
a) Between the orbits of Mars and Jupiter
b) In the Kuiper belt
c) In the Oort cloud
d) Between the orbits of the Jovian planets
e) Between the orbits of the terrestrial planets
a (between the orbits of Mars and Jupiter)
Observations of young stars (as well as theory) tell us that when the Sun was young the solar wind
a) Was weaker than it is today.
b) Was stronger than it is today.
c) Was about the same strength as it is today.
d) Was nonexistent.
e) Blew outward only along the Sun’s poles.
b (was stronger than it is today)
Which of the following is not a line of evidence supporting the hypothesis that our Moon formed as a result of a giant impact?
a) The Pacific Ocean appears to be a large crater—probably the one made by the giant impact.
b) Computer simulations show that the Moon could really have formed in this way.
c) The Moon’s average density suggests it is made of rock much more like that of the Earth’s outer layers than that of Earth as a whole.
d) The Moon has a much smaller proportion of easily vaporized materials than Earth.
a (the Pacific Ocean appears to be a large crater - probably the one made by the giant impact)
Ridges in the middle of the ocean are places where
a) One plate slides under another, returning older crust to the mantle.
b) Hot mantle material rises upward, creating volcanic islands.
c) Hot mantle material rises upward and spreads sideways, pushing the plates apart.
d) Plates push together, creating ocean mountain chains.
e) Plates slip sideways relative to one another.
c (hot mantle material rises upward and spreads sideways, pushing the plates apart)
