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Plate Tectonics & Earthquakes

7th Grade Earth Science

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3.These crustal "sections" move only centimeters per year driven by convection currents below.
6.Type of fault that forms when rock of crust is pulled apart (Rio Grande rift valley)
7.A large area of flat land elevated high above sea level
8."Weak" plastic-like layer of Earth's interior.
9.Plate boundary where two plates slip past each other
10.Point on surface directly above earthquake
12.Heat transfer by the movement of currents within a fluid (or gas)
16.Occurs when an earthquake's violent shaking suddenly turns loose, soft soil into liquid mud.
18.Shaking and trempling that results from the movement of rock beneath Earth's surface
19.Earthquake that occurs after a larger earthquake in the same area
23.Plate boundary where two plates come together
26.Water displaced by an earthquake may form this large wave
27.Scale utilized to rate an earthquake's magnitude based on the size of the earthquake's seismic waves
29.A force that acts on rock to change its shape or volume
30.Number geologists assign to an earthquake based on the earthquake's size
31.Device that bounces sound waves off underwater objects and then records the echoes of these sound waves
1.This theory explains the formation, movement, and subduction of Earth's plates. (2 Words)
2.Plate boundary where two plates move apart
4.These waves carry energy from an earthquake away from the focus or hypocenter
5.Dense, metallic main layer below the mantle.
7.Wegener's super continent
11.Heat transfer within a material or between materials that are touching
13.Seismic waves are measured by this instrument.
14.Transfer of heat energy through space
15.Fault where plates move past each other, shearing (San Andreas fault)
17.Earth's magnetic field is driven by movements in this layer (2 Words)
20.Process by which ocean floor sinks beneath a deep-ocean trench and back into the mantle
21.Measure of how much mass there is in a volume of a substance.
22.This and temperature increase as approach closer to middle of Earth.
24.Type of fault where rock of crust is compressed (Juan de Fuca, Northern Rocky Mountains)
25.Convection currents in this main layer drive the movement of crustal plates.
28.The main outer-most layer of Earth's interior.

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