(solution) I highlighted all the answers I have chosen, it says I have 17/18

(solution) I highlighted all the answers I have chosen, it says I have 17/18

I highlighted all the answers I have chosen, it says I have 17/18 right but I cannot see which one I got wrong. I checked the notes and the book over and over again and I could still not figure it out

1. What is the primary chemical constituent of the present day atmosphere of Mars?
A. carbon dioxide
B. nitrogen
C. hydrogen
D. oxygen
E. sodium 2. What statement concerning volcanoes on Mars is true?
A. They indicate that the core of Mars is much larger than the Earth's.
B. They are probably due to meteoric impact.
C. They are larger than those on Earth.
D. They are the source of oxygen in Mars' atmosphere.
E. They may actually just be mountains raised up by continental drift. 3. What does the presence of a planetary magnetic field suggest about its structure?
(Choose best answer)
A. Its core is probably composed of solid iron.
B. It has a rocky surface, with magnetism locked up in rocks as iron oxides. C. It probably has a molten iron core, and the rotation of the planet generates the
field.
D. The planet has been magnetized in the past by some passing object.
E. The planet has been disrupted at some time, so that material from its magnetic
interior has gotten out. 4. Why is the Earth's atmosphere so different from that of the other terrestrial planets?
A. Planetary atmospheres are entirely due to materials outgassed from the interior,
so the Earth must have just erupted different elements.
B. The Earth is less massive, so the other elements seen elsewhere are not on
Earth because they escaped from its weak gravity.
C. On the Earth, water dissolved the carbon dioxide and plants made oxygen.
D. Mars has more iron, and this plus oxygen made rust.
E. The strong intensity of sunlight at Earth's location created the oxygen from
water. 5. What is the primary reason why Mercury is difficult to see from the Earth?
A. It is a very small planet.
B. It is very faint.
C. It rotates very slowly. D. It always appears near the bright Sun.
E. Its orbit is highly elliptical. 6. Which of the following is a true observation of Mars indicating the presence of
annual seasons?
A. Plant growth has been detected in the springtime.
B. In each hemisphere, the polar cap changes in size as Mars orbits the Sun.
C. Volcanism shows a seasonal dependence.
D. Seasonal floods have been detected.
E. The magnetic field varies with orbital position. 7. Which surface feature is prominent on both Mercury and Mars?
A. maria
B. large active volcanoes
C. river beds
D. large wrinkled ridges (scarps)
E. craters 8. Why is Mars red?
A. Its surface rocks are highly radioactive.
B. Because of the way sunlight refracts through the Martian atmosphere.
C. Because of dust lifted into the atmosphere by Mars' high winds.
D. Its distance from the Sun keeps it cool and therefore red.
E. Iron oxide (rust) on the surface 9. Which of the following observations provide evidence that Mars had substantial
water in the past?
A. channels that meander over the surface
B. small pools of water today indicate more water in the past
C. large amounts of water vapor in the atmosphere
D. Mars' satellites, which consist primarily of water ice
E. an extensive ocean in the northern hemisphere 10. What is thought to have caused Mercury's scarp cliffs?
A. compression and shrinking during the crust's cooling
B. extremely large seismic events, which cracked open the hard surface
C. extensive lava flows early in the planet's history when the crust was still soft D. the motion of continental plates
E. large impact events 11. What is Olympus Mons?
A. a giant shield volcano on Mars
B. the tallest mountain on Mercury
C. one of Mars' moons
D. a mountain on the Moon that is higher than Mt. Everest
E. a volcano discovered on Mercury 12. Which one of the following surface features is found on all terrestrial planets and
the Moon?
A. maria
B. large volcanoes
C. river beds
D. large wrinkled ridges (scarps)
E. craters 13. Which one of the terrestrial planets and moons can be considered a "sister" planet
to the Earth in terms of mass and size?
A. Mars B. Mercury
C. Venus
D. The Moon 14. Apart from the Earth, which one of the terrestrial planets and moons is the most
likely place where life may have arisen?
A. Mars
B. Mercury
C. Venus
D. The Moon 15. Which of the following quantities determines whether a planet will exhibit
seasons?
A. average distance from the Sun
B. rotation period
C. density
D. atmospheric composition
E. axial tilt 16. Which planet has been visited by several rovers, including Spirit, Opportunity and
Curiosity?
A. Mercury B. Venus
C. Mars
D. Jupiter
E. Saturn 17. Why does the Earth have a more active geology than Mars?
A. Earth is closer to the Sun, thus receiving greater heating.
B. Earth has more extreme seasons.
C. Earth's Moon is more massive than Mars' moons.
D. Earth is more massive than Mars.
E. Earth has a thicker atmosphere than Mars. 18. What makes it possible for astronomers to calculate the mass of Mars?
A. the presence of magnetic fields.
B. the measured rotation rate.
C. measuring the orbital period of Mars around the Sun.
D. Phobos and Deimos.
E. the chemical composition of surface rocks.