Continental Drift
What is this evidence for: rock types and structures show continuing across continents.
Continental Drift
2 plates pulling apart
Divergent boundary
Lithosphere
Name something that affects magma
Pressure, Water, or Silicates
Supercontinent existed near 300 million years ago
Pangea
Hot materials rise to the top, cools, then sinks to fill gaps
Convection currents
A type of stress that bends, twists and breaks rocks apart
Shear stress
The spot withing the earth that the earthquake begins
Foci
Magma rock that is found on the oceanic crust, contains magnesium and iron, and is dark in color
Mafic
Hawaii
Undersea mountain range with a steep, narrow valley
Mid-ocean ridge
Syncline
The spot on the surface of the earth closest to the focus of an earthquake
Epicenter
Magma that is light-colored silicate and is found on the continental crust
Felsic
Proposed the hypothesis of continental drift
Alfred Wegener
Magnetic patterns on the ocean floor show alternate bands of
Normal and reverse polarity
Hanging wall moves downward in this fault
Normal fault
The fastest wave of an earthquake that squeezes rocks in the same direction they are going
Primary Waves
Opening in the top of a volcano that is less than 1KM in diameter
Crater or Summit Depression
Measures the amount of energy in an earthquake
Richter Scale
Sediment closer to the mid-ocean ridge is ______ and sediment farther from the mid-ocean ridge is ______
Younger, Older
Mountains still increase in elevation due to this event
Colliding of tectonic plates
The most powerful wave in an earthquake
Secondary waves
Large and violent volcano with layers of cooled lava and cinders
Composit or stratovolcano
Provided evidence for sea-floor spreading
Paleomagnetism