Earth Science Unit

2. the relatively thick part of the earth's crust that forms the large landmasses.
3. two high and low tides each day, and mixed
4. the alternate rising and falling of the sea
6. an obscuring of the light from one celestial body by the passage of another between it and the observer or between it and its source of illumination.
7. the coldest season of the year.
11. occurs when the Moon passes between Earth and the Sun.
12. the third season of the year.
14. an astronomical event that occurs when the Moon moves into the Earth's shadow, causing the moon to be darkened.
15. occurs when two tectonic plates move away from each other.
18. the outermost layer of Earth's lithosphere that is found under the oceans
20. places where plates slide sideways past each other.

1. an eclipse of the sun in which the edge of the sun remains visible as a bright ring around the moon.
5. a massive, irregularly shaped slab of solid rock, generally composed of both continental and oceanic lithosphere.
8. the hotest season of the year.
9. an eclipse in which the whole of the disk of the sun or moon is obscured.
10. an eclipse of a celestial body in which only part of the luminary is obscured or darkened.
13. When two plates come together, it is known as a _________ boundary.
16. large-scale processes affecting the structure of the earth's crust.
17. one high and low tide each day
19. the season after winter and before summer.