Science chapter 7 Plate Tectonics – Flashcards

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Pangaea
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The name _________________ means "all land".
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lithosphere
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The ridge part of the plates of the _____________ are made of oceanic crust or continental crust and upper mantle.
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Convection currents
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__________________ _________________, occurring in the mantle, are thought to be the force behind plate tectonics.
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continental drift
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The main lines of evidence for _____________ ______________ are fossil, rock, and climate clues, and the theory of seafloor spreading.
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plates
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Earth's ________________ move around on a special layer of the mantle.
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asthenosphere
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Earth's plastic like layer is the ________________.
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seafloor spreading
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The theory of ____________ ____________ was shown to be correct by age evidence and magnetic clues.
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plate tectonics
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The theory that describes Earth's crust and upper mantle as being broken into sections is called __________ _______________.
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ridges
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The youngest rocks in the ocean floor are locacted at the mid-ocean _______________.
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Harry Hess
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The seafloor spreading theory was proposed by ___________ __________.
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divergent
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Plate move apart at _____________ boundries.
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convergent boundries
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The places between plates moving together are called_____________ ____________.
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earthquakes
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Where plates slide past one another, __________ occur.
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younger than
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Ocean floor rocks are _____________ ____________ continental rocks.
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Pangaea
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The lack of explination for continental drift prevented many scientents from believing a single supercontinent called _____________once existed.
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reversal
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Studying the ocean floor, scientists found rocks showing magnetic _________________.
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subduction zones
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Oceanic plates are pushed down into the upper mantle in __________________.
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fossils and rocks
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The presence of the same ___________ __________ on several continents supports the idea of continental drift.
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hot, dense material below Earth's surface is forced upward
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Seafloor spreading occurs because ______________________________________________________________.
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rift valleys & plate boundries
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The results of plate movement can be seen at ________________________.
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convection current
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The cycle of heating, rising, cooling and sinking is called________________ _________________.
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samples of rock from different locations
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Scientists aboard the Glomar Challenger added to the evidence for the theory of seafloor spreading by providing _____________________.
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Himalayas
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The ________________ are forming where the Indo-Australian plates collides into the Eurasian plate.
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continental drift
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The hypothesis that continents have moved slowly to their current locations is called ______________ ____________.
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mountains, volcanoes, ocean basins
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As Earth's plates move apart at some boundaries, they collide at others, forming___________,_______________,__________________________.
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seafloor spreading
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Continental drift occurs because of ____________ _______________.
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magnetic field
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The alignment of iron-bearing minerals in rocks when they formed reflects the fact that Earth's __________ _________ has reversed itself several times in its past.
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