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The free-rider problem
Mare
Latin for "sea," often used to describe the large, dark basaltic plains on the Moon, formed by ancient volcanic eruptions.
Lunar Highlands
Elevated, mountainous regions on the moon's surface, characterized by high albedo, heavy cratering, and made predominantly of anorthosite.
Impact Craters
Circular depressions formed by the collision of a meteorite, asteroid, or comet with the Earth's surface, characterized by a raised rim and, in some cases, a central peak.
Topographic Relief Map
A map that shows the elevation and gradient of the Earth's surface with contour lines or shading to represent the terrain.
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