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23 Cards in this Set
- Front
- Back
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Continental crust |
Layer of rock found beneath the Earth's continents. Thick Less dense
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Oceanic crust |
Thinner, denser layer of rock found beneath the Earth's oceans. |
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Convection currents |
Hot currents in the Earth's mantle, which cause the tectonic plates to move. |
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Subduction zone |
Zone where oceanic crust sinks into the mantle. |
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Destructive plate margin |
Where 2 tectonic plates move towards each other. |
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Constructive plate margin |
Where 2 tectonic plates move away from each other - creating new land in between. |
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Conservative plate margin |
Where 2 plates are moving side by side. |
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Composite volcano |
Tall, steep-sided volcano found at destructive plate margins. |
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Shield volcano |
Gently sloping volcano found at constructive plate margins. |
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Primary effects |
First effects (of an earthquake, volcano etc.) |
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Secondary effects |
Later effects (of an earthquake, volcano etc.) |
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Sedimentary rocks |
Rocks, such as sandstone & limestone, formed of compressed sediment. |
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Ocean trench |
Very deep trenches found off the edge of continents, formed by oceanic plate subduction. |
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Magma chamber |
Where molten rock (magma) is stored underneath a volcano. |
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Vent |
Where magma escapes through a crack or fracture in the Earth's surface. |
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Supervolcano |
A volcano that erupts with a massive volume of material. |
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Richter scale |
Logarithmic scale that measures the magnitude (strength) of an earthquake. |
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Mercalli scale |
Scale used to classify the effects of an earthquake. |
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Seismograph |
Instrument used to measure the magnitudr of an earthquake. |
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Focus |
Point at which an earthquake starts beneath the ground - where shock waves radiate from. |
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Epicentre |
The point on the surface directly above the focus. |
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Acid lava |
Viscous (thick) lava which erupts from composite volcanoes. |
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Basic lava |
Thin, runny lava which erupts from shield volcanoes. |
