MEASURING THE EARTH and EARTH FACTS
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1 MEASURING THE EARTH and EARTH FACTS A) The shape of the Earth: a) An oblate spheroid (slightly flattened sphere) b) Flattened at poles and bulging at the equator c) polar circumference 40,008 km d) polar diameter 12,714 km (exaggerated picture, not to scale) e) equatorial circumference 40,076 km f) equatorial diameter 12,757 km g) From space (and with small models) the Earth appears to be a perfect sphere. Formatted: Font: (Default) TimesNewRoman, 12 pt, Bold B) Evidence for Earth's shape (ROUND vs FLAT) a) Photographs of the Earth from space or the moon (this is the best evidence - direct observation). b) Earth's shadow seen on moon during eclipse. c) Ships disappear over horizon bottom first. d) Altitude of Polaris varies with latitude. REMEMBER! THE ALTITUDE OF POLARIS EQUALS THE LATITUDE OF THE OBSERVER e) Angle of noon sun varies with latitude. Clock time remains the same along any longitude line. C) Evidence for Earth's shape (OBLATE SPHEROID) a) Gravitational measurements: 1) stronger at poles (closer to center) 2) weaker at equator (further from center) b) Special Note: Altitude of Polaris does not exactly match latitude. Moving 1 o north or south on the earth s surface does not always result in a change of exactly 1 o in the altitude of Polaris. If the earth was perfectly round this slight difference would not occur. D) Diameter of the Earth a) D = 2 x radius b) D = (2) (6.37 x 10 3 kilometers) c) D = x 10 3 kilometers or x 10 4 kilometers d) D= 12,740 Km E) Hydrosphere a) Water (salt and fresh) covering approx. 75% of the Earth b) Averages km in depth, deepest 7 mi. at Marianas Trench c) Oceans represent <1% of thickness of Earth F) Atmosphere a) Gas envelope surrounding Earth, has distinct layers b) air is 78% nitrogen, 21% oxygen, 1% other
2 c) Extends to approx. 150 km. d) Layers: 1) Troposphere (0 to 12 km) 2) Stratosphere (12 to 50 km) 3) Mesosphere (50 to 82km) 4) Thermosphere (82+ km) e) Interfaces between layers are called "pauses" 1) Tropopause 2) Stratopause 3) Mesopause G) Lithosphere a) Solid, rocky, outer shell of the Earth. (Covered by regolith, the loose rock & soil) b) Averages km. c) Thicker under continents - Continental Crust d) Thinner under oceans - Oceanic Crust. POSITIONS ON THE EARTH A) Coordinate system (grid) a) Latitude (aka parallels) 1) Measured in degrees/minutes/seconds 2) 1 degree ( o ) equals 60 minutes ( ), 60 seconds ( ) equals 1 minute 3) Latitudes run east-west, measure distance north and south 4) Change north-south: 0 o equator - 90 o North Pole 5) Maximum latitude = 90 o (N or S poles) 6) Minimum latitude = 0 o (equator) 7) Size of a degree varies with latitude due to shape of the Earth 8) Altitude of Polaris (North Star) = latitude (observable in N. Hemisphere only) b) Determination of latitude 1) Draw line to horizon 2) Draw line to Polaris 3) Angle formed by these lines is the latitude 4) Applies to Northern hemisphere only Remember! THE ALTITUDE OF POLARIS EQUALS THE LATITUDE OF THE OBSERVER! c) Longitude (aka meridians) 1) Measured in degrees/minutes/seconds 2) Run north-south connecting poles, measure distance east-west 3) Start-End: 0 o 180 o 4) Prime meridian (0 o ) through Greenwich England (GMT) 5) International Date Line (180 o ) 6) Time changes 1 hour per 15 o of longitude change 7) Move West = earlier / Move East = later
3 8) Time of Day stays the same along each longitude B) Fields a) Region of space w/measureable values 1) Examples: elevation/temperature/pressure b) Scalar fields 1) Values have magnitude only 2) Examples: elevation/temperature/pressure c) Vector fields 1) Values have magnitude and direction 2) Examples: Wind, magnetic fields, ocean currents C) Gradient (slope) and Rate of Change (speed) Equations change in field value between 2 points Gradient = change in distance between 2 points change in field value Rate of Change = change in time D) Isolines a) Lines on a map connecting points of equal value b) Special isolines: 1) Isotherms connect equal temperature points 2) Isobars connect equal atmospheric pressure points 3) Contour lines - connect points of equal elevation on Topographic Maps c) Interval - value difference between adjacent contour lines d) Index Contour Line - marked with its value e) Isolines interval small (close together) = steep gradient Isoline interval large (far apart) = gentle slope f) Contour lines seem to point in opposite direction of stream flowing across them (point uphill) RULE OF THE V
4 g) Sea level = 0 elevation h) Depression Contour lines w/hatchure marks = slope downward _]_]_]_]_]_]_]_]_] NOTE: Rule of the Repeat for first depression contour line i) The highest possible elevation between two contour lines is one interval value less than the next contour line would be. j) The lowest possible elevation between two contour lines is one interval value more than the next contour line would be.
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6. The greatest atmospheric pressure occurs in the 1) troposphere 3) mesosphere 2) stratosphere 4) thermosphere
1. The best evidence of the Earth's nearly spherical shape is obtained through telescopic observations of other planets photographs of the Earth from an orbiting satellite observations of the Sun's altitude
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