Earth Science

3. a unit of astronomical distance equal to the earth's distance from the sun
6. a small, cool area on the sun's photosphere
9. a nuclear change in which small atomic nuclei are forcefully combined to make larger nuclei
10. the hot outer atmosphere of the sun that extends out into space to become solar wind
12. the spin of an object around its center of mass
13. a long narrow channel on a moon or planet that is beleived to have originated from tectonic processes
14. the visible surface of the sun
16. an astronomical event that occurs when the sun, earth, and moon are aligned so the moon blocks a portion of the sunlight falling on the earth
17. the regular, repeating changing appearance of the shape of the lighted face of the moon visible from earth
18. the suns output of protons, electrons and small atomic nuclei into the solar system
19. a stream of solar plasma that rises into the corona from the chromosphere and then gradually falls back

1. orbital motion around a point such as the earth revolving around the sun
2. the suns apparent path among the stars as observed from Earth
4. a broad, lowland plain on the moon made of hardened lava darker and more level than surrounding highland areas
5. the lowest layer of the sun's atmosphere starting at the photosphere and extending out
7. the entire range of electromagnetic wavelengths that the sun emits
8. an astronomical event that occurs when the sun, earth, and moon are aligned so that the earth blocks the sunlight falling on the moon
11. a sudden explosion of the plasma from the sun's surface
15. a bright streak that radiates from craters or something that moves in a straight line