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NGS1 Sem. 2
A review of concepts and vocabulary for Semester 1 of NGS1.
Question | Answer |
---|---|
Magma | Molten (melted) rock material that is still underground. |
Lava | Molten (melted) rock material that is on the Earth's surface. |
Epicenter | The location on the Earth's surface directly above an earthquake's focus. The intensity will be greatest here. |
Focus | The underground location where the fault slip occurs to trigger an earthquake. |
Crust | The Earth's outermost layer is made of cool, rigid rock. |
Mantle | This layer is made of warm rock that is solid but capable of gradual flow and deformation. |
Outer Core | This layer is made of liquid iron and nickel due to the intense heat. Its convection currents cause Earth's magnetic field. |
Inner Core | The Earth's innermost layer is made of solid iron and nickel due to the intense pressure. |
Oceanic plate | This type of tectonic plate or crust is more dense than the other. |
Continental plate | This type of tectonic plate or crust is less dense than the other. |
Seismic Waves | The energy released from a fault slip (an earthquake) travels out in all directions as P-waves, S-waves, and L-waves - each with their own different speed and type of motion. |
Subduction | The oceanic plate is slowly moving under the other plate back into the mantle (in a convergent boundary). This creates a deep sea trench and volcanic activity nearby. |
Divergent plate boundary (O-O) | Where the plates pull apart and new crust is formed. Here this results in seafloor spreading. |
Divergent plate boundary (C-C) | Where the plates pull apart and new crust is formed. Here this results in rift valleys. |
Convergent plate boundary (C-C) | Where the plates push towards each other. Here this results in the building of steep mountains that are NOT volcanic) |
Convergent plate boundary (O-C) | Where the plates push towards each other. Here this results in an ocean trench offshore and coastal mountains with volcanic activity. |
Convergent plate boundary (O-O) | Where the plates push towards each other. Here this results in an ocean trench and a nearby volcanic island arc. |
Transform Fault plate boundary (any) | Where the plates slide past each other. The resulting friction form faults that eventually release energy as earthquakes. They are NOT volcanic. |