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Tectonics y9 Term 5 assessment
Terms in this set (10)
1. Which direction do divergent plate boundaries move in?
2. Which direction do conservative plate boundaries move in?
move alongside each other
3. What does the Richter scale measure?
the strength of an earthquake
What is the focus of an earthquake?
The point on the fault surface where seismic energy is first released.
What is the epicenter?
the point on the surface directly above the focus
What is subduction?
when the weight of the descending oceanic plate pulls the whole plate along and down
What is a shield volcano?
a Volcano that has gentle slopes formed by quick flowing lava.
what is a composite volcano
tall cone shaped volcanoes built up by successive layers of ash and lava
What is the lithosphere?
the rigid outer part of the earth, consisting of the crust and upper mantle.
What is the asthenosphere?
the upper layer of the earth's mantle, below the lithosphere, in which there is relatively low resistance to plastic flow and convection is thought to occur.
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