quiz 5 Astronomy

1. The crust of the Earth is covered by about ________ water in the hydrosphere. Student Response Value Correct Answer A. 60% B. 80%  C. 70% 100%    D. 50% E. 90% Score: 1/1 2. Compared to the density of water, our Earth averages: Student Response Value Correct Answer A. about 10 times denser, due to our core of iron and nickel.  B. about 5 times denser, like the Mercury and Venus. 100%    C. about the same density, similar to Saturn. D. about 4 times denser, similar to Mars. E. about 3 times denser, much like our Moon. Score: 1/1 3. From the center outward, the correct order is: Student Response Value Correct Answer A. molten metal hydrosphere, molten rock lithosphere, solid silicate crust. B. solid rock core, liquid metal mantle, solid rock crust. C. solid metal core, molten metal hydrosphere, rocky lithosphere, gases in atmosphere.  D. solid metallic inner core, molten metal outer core, silicate mantle and crust. 100%    E. liquid iron inner core, solid nickel outer core, rocky mantle, silicate crust. Score: 1/1 4. What gas is the primary constituent of our atmosphere? Student Response Value Correct Answer  A. nitrogen 100%    B. carbon dioxide C. oxygen D. helium E. hydrogen Score: 1/1 5. Which major atmospheric component is chiefly a product of life processes? Student Response Value Correct Answer A. water B. nitrogen C. carbon dioxide  D. oxygen 100%    E. hydrogen sulfide Score: 1/1 6. In what part of our atmosphere do we live? Student Response Value Correct Answer A. mesosphere  B. troposphere 100%    C. exosphere D. stratosphere E. ionosphere Score: 1/1 7. Above about 100 km, the high-energy portion of the Sun's radiation spectrum breaks down molecules into atoms. What is this part of Earth's atmosphere called? Student Response Value Correct Answer A. the troposphere B. the mesosphere C. the stratosphere D. the magnetosphere  E. the ionosphere 100%    Score: 1/1 8. The principal greenhouse gases in our present atmosphere are: Student Response Value Correct Answer A. sulfuric acid vapor and carbon dioxide. B. hydrogen sulfide and carbon disulfide. C. methane and ammonia. D. hydrogen and helium.  E. water vapor and carbon dioxide. 100%    Score: 1/1 9. The Greenhouse Effect works by trapping Student Response Value Correct Answer  A. outgoing infrared radiation from the Earth. 100%    B. incoming ultraviolet radiation from the Sun. C. incoming infrared radiation from the Sun. D. the heat from the Sun in Earth's atmosphere. E. outgoing ultraviolet radiation from the Earth. Score: 1/1 10. Why is the sky blue? Student Response Value Correct Answer A. the atmosphere scatters the light from the Sun    B. the atmosphere reflects the color of the oceans  C. the oceans reflect the light from the Sun into the atmosphere 0% D. the atmosphere reflects the light from the Sun E. the oceans refract the light from the Sun into the atmosphere Score: 0/1 11. Seismic waves are most useful for mapping: Student Response Value Correct Answer A. the density of the hydrosphere. B. the surface of Venus with Magellan.  C. the Earth's core and mantle. 100%    D. the depths of the oceans. E. the surface of Mars with Global Surveyor. Score: 1/1 12. Earth's magnetic field: Student Response Value Correct Answer A. lines intersect the atmosphere at the equator.  B. prevents charged particles in the solar wind from reaching the surface. 100%    C. is the force behind plate tectonics. D. is weakening the Van Allen radiation belts. E. is a remnant of the solar nebula's magnetic field. Score: 1/1 13. In noting that our world is "differentiated," we mean that: Student Response Value Correct Answer A. the Earth's magnetic field is different now in polarity than it was 700,000 years ago. B. radioactive heating in the core is at a slower pace than when the Earth was new. C. the Earth has evolved in a different pattern than any other planet.  D. the iron and nickel core is denser than the silicate mantle and crust. 100%    E. the density of its materials decreases as you go downward toward the core. Score: 1/1 14. When two tectonic plates collide: Student Response Value Correct Answer A. they always produce high mountain chains like the Himalayas.  B. they continue moving, producing a variety of large deformations. 100%    C. they both stop moving. D. volcanoes always mark the boundary between them. E. that region is safe from earthquakes now the plates are fixed. Score: 1/1 15. When strong solar winds are displaced poleward by our magnetic fields, we get: Student Response Value Correct Answer A. the Van Allen radiation belts.  B. intense auroral displays. 100%    C. hurricanes in the tropics. D. droughts and dust bowls in the American West. E. sunspots. Score: 1/1 16. The region around Earth where the magnetic field traps charged particles is the: Student Response Value Correct Answer A. exosphere.  B. Van Allen Radiation Belts. 100%    C. aurora borealis and aurstralis. D. ozone layer. E. corona. Score: 1/1 17. The presence of a magnetic field is a good indication that: Student Response Value Correct Answer A. the Earth's interior is similar to Mercury's, as both have fields. B. a huge iron meteorite lies somewhere high up in the mantle, not in the core. C. the Earth's interior must be completely molten to the center. D. the Earth's interior has had time to solidify, with a rigid bar magnet created.  E. we have a liquid metal outer core, spinning rapidly as we rotate. 100%    Score: 1/1 18. What is true of spring tides? Student Response Value Correct Answer  A. The difference between low and high tides would be greatest. 100%    B. The third quarter Moon would be high overhead at dawn. C. The Moon's phase will be first quarter. D. There would be one high and one low tide each day. E. The difference between low and high tides would be smallest. Score: 1/1 19. At what phase would tidal variation be the least during the entire day? Student Response Value Correct Answer A. waxing gibbous B. full moon C. waning crescent D. new moon  E. first quarter 100%    Score: 1/1 20. Why is the tide due to the sun smaller than the tides due to the moon Student Response Value Correct Answer A. because the sun is made of gases which produce no tide. B. because the the sun gravity cancel the tidal force  C. because the sun is further away from earth than the moon 100%    D. because the sun has more mass than the moon Score: 1/1