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Defend Earth from alien invaders
the surface features of a place or region. The topography of a region includes hills, valleys, streams, lakes, bridges, tunnels, and roads
Height above sea level
the difference in elevation between the highest and lowest parts of an area
feature of Earth's surface (examples: mountains, valley, hill, plain, mesa)
area of level land, usually at low elevation and often covered with grasses with low relief
A landform with high elevation and high relief
a series of connected mountains with the same general shape and structure
a large area of flat land elevated high above sea level
a large area of land where the topography is similar
a two-dimensional, or flat, representation of Earth's surface or a portion of it as seen from above
a sphere on which a map (especially of the earth) is represented
Used to compare distance on a map or globe to distance on Earth's surface.
On a map, pictures used by mapmakers to stand for features on Earth's surface.
shows which symbols are used on a map and what they represent
an imaginary circle around the middle of the earth, halfway between the North Pole and the South Pole
one half of the earth
line of the global grid running from the North Pole to the South Pole through Greenwich, England
distance north or south of the Equator, measured in degrees
measures distance east and west from the Prime Meridian
Global Positioning System
a navigational system involving satellites and computers that can determine the latitude and longitude of a receiver on Earth by computing the time difference for signals from different satellites to reach the receiver
a map that shows the surface features of an area
A line on a topographic map that connects points of equal elevation
On a topographic map, a heavier contour line that is labeled with elevation of that contour line in round units
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