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Magma	mobile, high-temperature molten state of rock
Mantle	rock layer of shell of the Earth beneath the crust and surround the core
Map	a paper representation of space showing point, line, or area data
Mass Wasting	spontaneous downhill movement of soil, regolith, bedrock under the influence of gravity
Meridian of Longitude	north-south line on the surface of the globe, connecting the north pole and the south pole
Mesa	table-topped plateau bounded by cliffs
Metamorphic Rock	rock altered in physical structure and/or chemical composition by action of heat, pressure, or shearing
Mineral	naturally occurring inorganic substance
Moraine	accumulation of rock debris carried by a glacier or ice sheet and deposited by the ice
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