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### 16 Cards in this Set

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 Oblate Spheroid Because of forces associated with the earth's rotation, the area near the equator bulges slightly and the polar regions are flattened slightly, giving the earth an oval shape Great Circle An imaginary line drawn in any direction around Earth's surface and whose plane passes through the center of Earth. It’s the largest circle that can be drawn around the world through two points Small Circle Circles whose plane does not pass through the center of the earth and doesn’t divide the earth into two equal halves Latitude The angle between the equator and any position north or south of the equator Longitude The angular distance east or west of the prime meridian Prime Meridian The line that passes through Greenwich, England or 0 degrees longitude Parallel Latitude lines that circle the globe, are evenly spaced, and are parallel to the equator and each other Meridian Lines of longitude running North to South, converging at the poles. When joined with their mate, they make a great circle. Township A square plot 6 miles on each side Section 1 square mile of a townshop, or 640 acres. They are designated by numbers 1-36 and begin in the NE Corner Legend A key to symbols used on a map Scale The relationship or ratio between the actual distance on Earth and the same distance as it appears on the map Representative Fraction a ratio that is free of units of measure Topo Contour Line isolines connecting points on a map that are at the same elevation above mean sea level Contour Interval the constant vertical difference in elevation between adjacent contour lines Profile a side view to help visualize an area