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24 Cards in this Set
- Front
- Back
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Altitude |
the height of an object or point in relation to sea level or ground level |
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Aphelion |
the point in the orbit of a planet, asteroid, or comet at which it is furthest from the sun |
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Asthenosphere |
the upper layer of the earth's mantle, below the lithosphere, in which there is relatively low resistance to plastic flow and convection is thought to occur |
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Autumnal Equinox |
the equinox in autumn, on about September 22 in the northern hemisphere and March 20 in the southern hemisphere |
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Axial Tilt |
angle between an object's rotational axis and its orbital axis |
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Azimuth |
the direction of a celestial object from the observer, expressed as the angular distance from the north or south point of the horizon to the point at which a vertical circle passing through the object intersects the horizon |
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Ellipse |
Oval |
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Elliptical |
Pertaining to or having a form of an ellipse |
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Equator |
an imaginary line drawn around the earth equally distant from both poles, dividing the earth into northern and southern hemispheres and constituting the parallel of latitude 0° |
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Greenhouse Effect |
the trapping of the sun's warmth in a planet's lower atmosphere due to the greater transparency of the atmosphere to visible radiation from the sun than to infrared radiation emitted from the planet's surface |
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Lithosphere |
the rigid outer part of the earth, consisting of the crust and upper mantle |
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Mantle |
The region of the interior of the Earth between the core (on its inner surface) and the crust |
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P waves |
a longitudinal earthquake wave that travels through the interior of the earth |
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Polaris |
is the brightest star in the constellation Ursa Minor, and the 50th brightest star in the night sky. It is very close to the north celestial pole |
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Perihelion |
the point in the orbit of a planet, asteroid, or comet at which it is closest to the sun |
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Revolution |
an instance of revolving |
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Rotation |
the action of rotating around an axis or center |
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Secondary waves |
Secondary waves cause the rocks they pass through to change in shape. These waves are the second fastest traveling seismic waves |
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Summer solstice |
the solstice that marks the onset of summer, at the time of the longest day, about June 21 in the northern hemisphere and December 22 in the southern hemisphere |
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Tropic of Cancer |
the parallel of latitude 23°26ʹ north tropic of Cancer or south tropic of Capricorn of the equator |
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Tropic of Capricorn |
the parallel of latitude 23°26ʹ north tropic of Cancer or south tropic of Capricorn of the equator |
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Vernal Equinox |
the equinox in spring, on about March 20 in the northern hemisphere and September 22 in the Southern Hemisphere |
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Winter solstice |
the solstice that marks the onset of winter, at the time of the shortest day, about December 22 in the northern hemisphere and June 21 in the Southern Hemisphere |
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Zenith |
the highest point reached by a celestial or other object |
