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10 Cards in this Set

  • Front
  • Back
crust
the thin outermost layer of the Earth
continental crust
very old crust (some as old as 4 billion years) and about 30 km. thick
oceanic crust
young crust (generally younger than 200 million years) and 5-10 km. thick
mantle
the zone of the Earth below the crust and above the core
lithosphere
the rigid, upper layer of the mantle that is solid
asthenosphere
the lower layer that is hot enough to flow slowly
Global Positioning System (GPS)
a satellite-based system for accurate location of points on the Earth (there are 24 of them, and each sends signals for 4 others)
basalt
a kind of volcanic igneous rock that makes up the ocean floor
mid-ocean ridge
a chain of undersea ridges extending through all of the Earth's ocean basins, and formed by sea-floor spreading
offsets
stiches in the mid-ocean ridge that are perpendicular to the axis of the ridge; point in the direction the plates are moving