Lesson2c – Plate tectonics. The Effects of Plate Tectonics. Pacific Basin region. Volcanoes of the Earth. Mountain Ranges of the Earth. What is the evidence so far?. Majority of Earthquakes occur at plate boundaries. Particularly in around the Pacific basin. (The Ring of Fire).
The Effects of Plate Tectonics
Magnetic striping is prominent in the Atlantic. Red is strong magnetic field in one direction while blue is strong in the negative direction
Convection currents in the asthenosphere (plastic-like mantle) brings hot material from deep inside the Earth up to the Lithosphere.
The Oceanic crust and lithosphere of the Pacific is forced underneath the continental crust and lithosphere.
The crust of the Earth is rich in silicates. The amount of silica (SiO2) controls the viscosity of the lava. The more SiO2 the more viscous, or resistant to flow, the lava is.
Which volcano was created from highly viscous lava?
“A” has high viscosity lava , “B” has lava that flows