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- 1. Multiple Choice
Of the four terrestrial planets, Earth is the _____largestsecond largestthird largestsmallest - 2. Multiple ChoiceUnlike the other three terrestrial planets, Earth has _____liquid wateran iron corepolar ice capscarbon dioxide in the atmosphere
- 3. Multiple ChoiceEarth's inner core is solid, and made mostly of _____iron oxidenickel and cobaltiron and nickelnickel and copper
- 4. Multiple ChoiceWhat percentage of the radius of the Earth is comprised by the solid inner core?10%20%30%40%
- 5. Multiple ChoiceThe outer core is mostly iron and nickel, but it’s _____unstablesolidliquidradioactive
- 6. Multiple ChoiceThe consistency of the mantle is like _____molten lavavery thick hot plasticmolasses in Januarymoldable clay
- 7. Multiple ChoiceWhat is the name of the solid layer of rock, comprising Earth's outer surface?mantlecrustouter coreshell
- 8. Multiple ChoiceEarth's crust isn’t a solid piece; it’s broken up into large _____trayssheetsplattersplates
- 9. Multiple ChoiceConvection currents in the mantle cause warmer material to rise at a rate of a few _____centimeters per yearmeters per yearkilometers per yearmeters per second
- 10. Multiple ChoiceThe plates in the Earth's crust slide around at about the rate _____a snail movesyour fingernails growyour hair growsbamboo grows
- 11. Multiple ChoiceWhich part of the Earth is about as hot as the surface of the Sun?crustouter mantleinner mantlecore
- 12. Multiple ChoiceWhich element, deep inside the Earth, adds heat as it radioactively decays?ironthoriumuraniumplutonium
- 13. Multiple ChoiceEarth's magnetic field is mainly generated by _____convection of liquid in the outer corerotating solid in the inner coreconvection of liquid in the inner corerotating solid in the outer core
- 14. Multiple ChoiceHow high is the Kármán line, the boundary between the Earth's atmosphere and outer space?10 km above sea level50 km above sea level100 km above sea level500 km above sea level
- 15. Multiple ChoiceWhich gas comprises 78% of our atmosphere?oxygennitrogencarbon dioxideargon
- 16. Multiple ChoiceWhat percent of our atmosphere is oxygen?3521158
- 17. Multiple ChoiceWhich atmospheric molecule is good at absorbing solar ultraviolet light?oxygenozonecarbon dioxideargon
- 18. Multiple ChoiceWhat is the name for Earth's natural light display, caused by energized solar wind particles?aortaauroraarrhythmiaarboreal
- 19. Multiple ChoiceThe atmosphere exerts a pressure on the surface of the Earth of about _____a kilogram per square centimetera kilogram per square metera gram per square centimetera gram per square meter
- 20. Multiple ChoiceWhat percentage of the Earth's surface is covered in water?about 50%about 60%about 70%about 80%
- 21. Multiple ChoiceWhich atmospheric molecule traps infrared light, leading to the greenhouse effect?oxygenozonenitrogencarbon dioxide
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