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Chapter 20
6th grade Earth Science
| Term | Definition |
|---|---|
| Geocentric model | an early model of the solar system where Earth is the center of the revolving planets and stars |
| Heliocentric model | a modern model of the solar system where the sun is the center and Earth/other planets revolve around the sun |
| ellipse | an oval shape, which may be elongated or nearly circular |
| corona | the outer layer of the sun which looks like a white halo |
| sunspots | areas of gas on the sun's surface that are cooler |
| solar flares | eruptions of gas from the sun's surface |
| terrestrial planets | the four inner planets that are small and have rocky surfaces |
| greenhouse effect | the trapping of heat by the atmosphere |
| gas giants | the outer planets that are more massive than Earth and do not have solid surfaces |
| meteoroid | a chunk of rock or dust in space that came from a comet or asteroid |
| meteor | a streak of light in the sky produced by the burning of a meteoroid in Earth's atmosphere |
| meteorite | a meteoroid that passes through the atmosphere and hits Earth's surface |
| comet | a loose collection of ice, dust, and small rocky particles whose orbits are usually very long, narrow ellipses |
| asteroid | rocky object revolving around the sun, but are too small and numerous to be considered planets |
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