Week #4 Vocabulary.

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Presentation transcript:

Week #4 Vocabulary

Magnitude Earthquake size is a quantitative measure of the size of earthquake at its source. Seafloor Spreading Formation of new oceanic crust, created as magma from the mantle rises in between plates or ridges and spreads out. Pangaea Hypothetical supercontinent that existed when all continents were joined from 300 to 200 million years ago.

Focus Location where the earthquake begins. Epicenter The point on the Earth’s surface located directly above the focus. Reverse Fault When the hanging wall rises relative to the footwall. Occurs in areas undergoing compression or squishing. Strike Slip Fault A fault in which the rock strata are displaced mainly in a horizontal direction.

Normal Fault When the hanging wall has moved downward relative to the footwall. Occurs where two blocks of rock are pulled apart by tension. Ring of Fire Major area around the Pacific Ocean where a large number of earthquakes and volcanic eruptions occur. Continental drift The gradual movement of the continents across the Earth’s surface through geological time.