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5 Sci Ch 7 Test 7
| Term | Definition |
|---|---|
| 78% | percent of nitrogen in the earth's air |
| 93,000,000 miles | How far away is the sun? |
| air pressure | the pressure of atmospheric or compressed air; the total weight of air on some particular place on earth |
| airglow | a light visible on the horizon on especially dark and clear nights; cast by ions created when solar rays strip electrons from electrons from atoms of gases in the upper atmosphere |
| atmosphere | the layer of gases surrounding a planet or moon; |
| aurora | light display seen near the poles caused by the collisions of particles from the solar wind with molecules of air |
| aurora borealis | the northern lights |
| chromosphere | the sun's atmosphere that has a colorful layer of gases that surrounds the sun's photosphere; visible only through a monochromator |
| core | innermost section of the sun |
| corona | a vapor blanket that surrounds the chromospheres and extends to about 249,000miles from the surface of the sun; visible only during a total solar eclipse |
| crescent | the first phase after a new moon |
| Earth | only planet suitable for life. |
| exosphere | topmost layer of the earth's atmosphere |
| gibbous | bulging |
| ion | an atom that is either positively charged because it has lost some or all of it electrons, or negatively charged because it has picked up one or more extra electrons |
| Jupiter | largest planet with the big red spot |
| lunar eclipse | the obscuring of the moon that occurs when the earth comes between it and the sun; the moon is temporarily darkened as it passes through the earth's shadow |
| magnetic | earth is surrounded by this field that protects it from harmful space particles |
| Mars | the red planet. |
| Mercury | planet closest to the sun |
| mesosphere | meteoroids burn up in this layer |
| meteoroids | small solid pieces of rocky debris traveling through space; many meteoroids are fragments broken off asteroids |
| Neptune | royal blue planet where the wind blows hardest. It has a moon named Triton. |
| nitrogen | 78% of the air is made of this gas |
| ozone | a form of oxygen with three atoms of oxygen in its molecule instead of the two atoms found in in molecules of normal oxygen gas |
| ozone layaer | layer in the stratosphere that helps protect the earth from ultraviolet rays |
| photosphere | sphere of light; the surface layer of the sun; the layer visible to the observer on Earthni |
| rareified | scarce; thin and less dense |
| Saturn | planet with 7 rings and over 60 moons |
| solar eclipse | the blocking out of the sun's light that occurs when the moon comes between the sun and the earth |
| solar wind | a steady stream of subatomic particles speeding outward from the sun and through space at a million miles per hour |
| sun | where the light of the moon comes from |
| sunspots | darker areas on the outer surface of the sun |
| troposphere | Layer of Earths's atmosphere closest to the Earth where weather occurs |
| Uranus | the first planet discovered in modern times. It was discovered by Sir Wm Herschel. It rotates on it's side. |
| Venus | Earth's twin and brightest planet in the sky |
| Where do sunspots occur? | on the photosphere |
Created by:
Mrs_CC
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