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3.a line on a diagram or map connecting points relating to the same time or equal times.
5.an instrument used for measuring magnetic forces, esp. the earth's magnetism.
7.the formation of new areas of oceanic crust, which occurs through the upwelling of magma at midocean ridges and its subsequent outward movement on either side. (2 Words)
10.the sideways and downward movement of the edge of a plate of the earth's crust into the mantle beneath another plate.
11.the branch of geophysics concerned with the magnetism in rocks that was induced by the earth's magnetic field at the time of their formation.
12.is the movement of tectonic plate lithosphere due to convection currents in the asthenosphere. When the currents circulate they pull the tectonic plates down causing subduction. The slab pull force is a tectonic plate force due to subduction (2 Words)
1.states that Earth's crust and ridge upper mantal are broken into enormous slabs called plates (4 Words)
2.is a proposed mechanism for plate motion in plate tectonics. Because mid-ocean ridges lie at a higher elevation than the rest of the ocean floor, gravity causes the ridge to push on the lithosphere that lies farther from the ridge. (2 Words)
4.the gradual movement of the continents across the earth's surface through geological time. (2 Words)
6.a geomagnetic reversal is a change in the Earth's magnetic field such that the positions of magnetic north and magnetic south are interchanged (2 Words)
8.a large elongated depression with steep walls formed by the downward displacement of a block of the earth's surface between nearly parallel faults or fault systems. (2 Words)
9.a Greek word that means "all the Earth."

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