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FCSDGeo-Planet Earth
Planet Earth vocabulary (1)
| Term | Definition |
|---|---|
| altitude | height, measured in degrees, of an object above an observer's horizon |
| atmosphere | shell of gases that surrounds a planet, for example, the air around Earth |
| circumference | perimeter of a circle, ot the straight-line distance around a sphere |
| contour interval | difference in height between two adjacent contour lines |
| contour line | isoline on map that connects places with the same elevation & shows the shape of the land |
| contour map | map that shows the shape of the land using contour lines; a map showing an elevation field; AKA topographic map |
| diameter | the distance through the center of an object |
| equator | imaginary line line that circles Earth halfway between the North & South poles |
| field | region of space in which a similar quantity can be measured at every point or location |
| gradient | rate of change in field values bewteen two points in a field; the average slope |
| Greenwich Mean Time | time based on observations of the sun along the prime meridian |
| hydrosphere | Earth's liquid water, including oceans, lakes, streams, & groundwater |
| isobar | line of a weather map connecting places with the same atmospheric pressure |
| isoline | line connecting points having the same value within a field |
| isotherm | line within a temperature field or on a weather map that connects places that have the same temperature |
| latitude | angular distance in degrees north or south of the equator; varies from 0 degrees at the equator to 90 degrees at the poles |
| lithosphere | solid portion of Earth below the atmosphere & hydrosphere; a solid layer that includes the crust & the upper portion of Earth's mantle |
| longitude | angular distance in degrees est or west of the prime meridian; varies from 0 degrees at the prime meridian to 180 degrees near the middle of the Pacific Ocean |
| meridian | imaginary semicircle, drawn around Earth from the North Pole to the South Pole, that represents a constant longitude |
| model | representation of an object or natural event |
| navigation | science of locating position on Earth |
| North Star | Polaris; the star located almost directly above the North Pole |
| oblate spheroid | nearly spherical shappe of Earth, slightly flattened at the poles & slightly buldging at the equator |
| parallel | imaginary line drawn around Earth parallel to the equator that represents a constant latitude |
| Polaris | North Star; the star located almost directly above the North Pole |
| prime meridian | imaginary line (semicircle) that runs through Greenwich, England fron the North Pole to the South Pole |
| scale | ratio of the dimensions of the real object ot its model |
| slope | gradient; rate of change in field values bewteen two points in a field; the average slope |
| topographic map | map that shows the shape of the land using contour lines; a map showing an elevation field; AKA contour map |
| topographic profile | a cross-sectional view that shows the elevation of the land along a particular baseline |
| troposphere | lowest layer of air; reaches from Earth's surface up to about 12 km that contains most of the mass of the atmosphere |
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