Solar System Overview - Quiz 7

1. .Which of the following planets are primarily rocky with iron cores?
A).. Venus, Jupiter, and Neptune.
B)..Mercury, Venus, and Pluto.
C).. Mercury, Venus, and Earth.
D)..Jupiter, Uranus, and Neptune.
E)..Mercury, Saturn, and Pluto.

2. One explanation of why the planets near the Sun are composed mainly of rock and iron is that
A)...the Sun's magnetic field attracted all the iron in the young Solar System into the region around the Sun.
B)...the Sun is made mostly of iron. The gas ejected from its surface is therefore iron so that when it cooled and condensed it formed iron-rich planets near the Sun.
C)...the Sun's heat made it difficult for other substances such as ices and gases to condense near it.
D)...the statement is false. The planets nearest the Sun contain large amounts of hydrogen gas and subsurface water.
E)...the Sun's gravitational attraction pulled iron and other heavy material inward and allowed the lighter material to float outward.

3. Which of the following features of the Solar System does the solar nebula hypothesis explain?
A)... All the planets orbit the Sun in the same direction
B)... All the planets move in orbits that lie in nearly the same plane.
C)...The planets nearest the Sun contain only small amounts of substances that condense at low temperatures.
D)... All the planets and the Sun, to the extent that we know, are the same age.
E)... All of the above.

4. The numerous craters we see on the solid surfaces of so many Solar System bodies are evidence that
A)... they were so hot in their youth that volcanoes were widespread.
B)... the Sun was so hot that it melted all these bodies and made them boil.
C)... these bodies were originally a mix of water and rock. As the young Sun heated up, the water boiled, creating hollow pockets in the rock.
D)... they were bombarded in their youth by many solid objects.
E)... all the planets were once part of a single, very large and volcanically active mass that subsequently broke into many smaller pieces.

5. Why is Pluto not considered a Jovian planet?
A)... Its mass and radius are so small, and it lacks the thick atmosphere of hydrogen seen on the other Jovian planets.
B)... It is so far out in the Solar System.
C)... Its interior is mostly rock and iron.
D)... Its atmosphere is rich in oxygen, making it more like the Earth.
E)...It is not really orbiting the Sun but is simply drifting through the outer edge of the Solar System.

Your Answers
Your answer to the question was