1. The __-_____c Ridge is the largest tectonic feature on our planet. Mid-Atlantic 1

2. These transverse seismic waves can NOT travel through Earth's liquid outer core. S-waves 2

3. These compressional seismic waves can travel through both of Earth's inner & outer cores. P-waves 3

4. In the past, most of the landmass on Earth was concentrated in a single, large c________. continent 4

5. From igneous rock dating, we have found that the _____y of Earth's magnetic field has undergone many unexplained changes in periods of thousands of years. polarity 5

6. The crust of the Earth is covered by about __% of water in the hydrosphere. (within + or – 5%) 70% 6

7. Which of the following layers of the Earth is unique among the terrestrial planets? A) hydrosphere B) mantle C) crust D) core A) hydrosphere 7

8. The Earth’s average overall density is about __ times denser than water. (a number from 2-9) 5 8

9. List the Earth’s layers from the center outward. (do NOT include the atmosphere) Inner core, outer core, mantle, crust 9

10. What is the primary gas of Earth’s atmosphere? (highest percentage) nitrogen 10

11. What is the primary gas of Earth’s atmosphere mainly derived from life processes on the Earth? oxygen 11

12. This atmospheric component is vital for protecting life on Earth’s surface from excessive ultraviolet radiation. the ozone layer 12

13. In which layer of Earth’s atmosphere do we live? troposphere 13

14. Which 2 parts of the Sun's radiation are responsible for heating Earth's surface? (pick 2 of these) gamma x-ray ultraviolet visible infrared radio visible & infrared 14

15. The principal greenhouse gases in our present atmosphere are ____ _____ & ____ ____. carbon dioxide & water vapor 15

16. The ________e ____t works by trapping outgoing infrared radiation from the Earth. Greenhouse Effect 16

17. What percentage of Earth's atmosphere (by volume) is carbon dioxide (CO 2 )? A) 77 B) 33 C) 21 D) 3 E) 0.03 E) 0.03% 17

18. clouds What forms when water vapor condenses out at the cool tops of convection cells? 18

19. Seismic wave (or earthquake) 19 S______ w___ data is useful in determining the structure of the Earth.

20. Why the sky is blue The atmosphere’s scattering of light from the Sun helps explain this phenomena. 20

21. differentiated The Earth’s layers vary in composition and density. Because of this, we say that the Earth is d____________d. 21

22. P, S 22 During an earthquake, __ waves travel faster and thus arrive sooner than do the __ waves.

23. tectonic plates When two ______c ____s collide, they continue moving, producing a variety of large deformations. 23

24. magnetic field When strong solar winds are displaced poleward by our _______c ____, we get intense auroral displays. 24

25. The region around Earth where the magnetic field traps charged particles is the __n ____n Radiation Belts. Van Allen 25

26. liquid 26 The presence of a magnetic field is a good indication that we have a ____d metal outer core, spinning rapidly as we rotate.