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Plate tectonics

Across
Imaginary east-west line that circles Earth halfway between geographic poles
Deep valley which runs down the middle of a mid-ocean ridge
Volcanic mountain with a broad base and gently sloping sides, made from lava flows
A fault where the rocks above the fault move up
Melted rock beneath Earth's surface
Idea that continents move from one part of Earth to another
Ratio between the mass and the volume of a substance, found by dividing an objects mass by its volume
Instrument that measures and records seismic waves
Large moving section of lithosphere that contains continents and seafloor
Movement of a fluid because of density differences
Point on Earth's surface directly above an earthquake focus
Down
Name of the hypothetical great continent thought to have split into the landmasses known today
Opening in Earth's crust where melted rock reaches Earth's surface
Numerical description of the size of seismic waves produced by an earthquake
Theory the solid plates move on top of the putty like anesosphere
Measurement of angular distance on the Earth north or south of the equator
Pushing of the edge of one plate below the edge of another
Measurment of angular distance on the Earth east or west of the prime meridian
The true location of an earthquake and source of seismic waves
Solid Outer Layer of Earth including both crust and upper mantle