AST Chp 6

5) The atmospheric pressure on Venus A) shows an extreme change with the seasons. B) is much lower than on Earth. C) is about the same as on Mercury. D) is much higher than on Earth. E) causes variations in surface temperature.

D) is much higher than on Earth.

11) Valles Marineris is the most striking example of a(n) A) impact crater. B) shield volcano. C) oceanic trench. D) rift valley. E) scarp.

D) rift valley

7) The main constituent of the Martian atmosphere is A) hydrogen. B) helium. C) methane. D) carbon dioxide. E) nitrogen.

D)Carbon Dioxide

12) Which of the following characterizes a shield volcano? A) It sits above a hot spot in the planet's mantle. B) It is formed by moving tectonic plates. C) It can erupt only briefly before being dragged off the hot spot. D) It cannot get as high as Mt. Everest before the thin crust starts slumping. E) It cannot grow very large, for it has a very short span of eruption.

A) It sits above a hot spot in the planet's mantle.

3) Which planet shows the widest range of surface temperatures between day and night? A) Mercury B) Venus C) Earth D) Mars E) Uranus

A) Mercury

2) Which three worlds have almost identical densities? A) Mercury, Venus, and Earth B) Mercury, Mars, and our Moon C) Deimos, Phobos, and our Moon D) Earth, Moon, and Mars E) Mercury, Earth, and Mars

A) Mercury, Venus, and Earth

16) Much of the water on Mars A) is thought to be in a layer of permafrost just below the surface. B) lies in shallow pools near the poles. C) is locked in the seasonal ice cap. D) is found in deep pools near the equator. E) is in the form of clouds.

A) is thought to be in a layer of permafrost just below the surface.

9) Our most detailed maps of Venus come from A) the Magellan space probe. B) the Hubble Space Telescope. C) direct observation from Earth-based optical telescopes. D) manned landings. E) Earth-based radio telescopes.

A) the Magellan space probe

15) The largest difference between Mars' northern and southern hemispheres is that A) the southern appears older, with more impact craters. B) the northern has all the outflows and must have been much hotter. C) the northern is higher overall, despite some high volcanoes in the south. D) the southern has a polar cap, but none ever forms in the north. E) the southern is much darker, with large mare-like basaltic lava flows.

A) the southern appears older, with more impact craters.

14) That the Tharsis region on Mars has so few craters A) proves tectonic activity is taking place. B) is due to the very low elevation of the region. C) suggests it is the youngest region on the planet. D) suggests it is at the center of a particularly strong magnetic field. E) is due to annual flooding and water erosion.

C) suggest it is the youngest region on the planet.

19) The direction of the rotation of Venus is exceptional because it is in a __________ direction.

Clockwise

6) What is the main constituent of the atmosphere of Venus? A) oxygen B) nitrogen C) hydrogen D) carbon dioxide E) sulfuric acid

D) Carbon Dioxide

8) Mercury's surface most resembles which of these? A) the Earth's deserts B) the lunar far side C) the lunar mare D) Venus' polar regions E) Mars' deserts

B) the lunar far side

13) What is true of Mars? A) Its magnetic field is stronger than Earth's B) Its atmosphere is mostly water vapor. C) Iron oxide on the surface is responsible for its reddish color. D) A pool of water was discovered by the Mars Rover. E) Definite microfossils have been found.

C) Iron oxide on the surface is responsible for its reddish color.

21) Of all the planets, the axial tilt and rotation period of _____ is most like our own.

Mars

17) Of all the planets known in antiquity, __________ is the hardest to observe visually.

Mercury

20) The planet which shows us the widest range of surface temperatures between day and night is ________.

Mercury

18) The only two planets which can transit the Sun are ________________.

Mercury and Venus

1) Which of these gets so bright as to be seen in daylight at times? A) Mercury B) Venus C) Mars D) Jupiter E) Saturn

B) Venus

4) Venus' rotation on its axis A) is the fastest of the terrestrial planets. B) is clockwise, unlike most other solar system objects. C) shows it is tidally locked in its orbit around the Sun. D) is highly tilted to its orbital plane, causing large seasonal changes. E) prevents us from seeing all of its surface features.

B) is clockwise, unlike most other solar system objects.

10) Like Olympus Mons, volcanoes on Venus A) form where continental plates collide. B) are much larger than typical volcanoes on Earth. C) have been extinct for billions of years. D) only form at the equator. E) are shield volcanoes.

E) are shield volcanoes