Science chapter 7 Plate Tectonics

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Pangaea

The name _________________ means "all land".

lithosphere

The ridge part of the plates of the _____________ are made of oceanic crust or continental crust and upper mantle.

Convection currents

__________________ _________________, occurring in the mantle, are thought to be the force behind plate tectonics.

continental drift

The main lines of evidence for _____________ ______________ are fossil, rock, and climate clues, and the theory of seafloor spreading.

plates

Earth's ________________ move around on a special layer of the mantle.

asthenosphere

Earth's plastic like layer is the ________________.

seafloor spreading

The theory of ____________ ____________ was shown to be correct by age evidence and magnetic clues.

plate tectonics

The theory that describes Earth's crust and upper mantle as being broken into sections is called __________ _______________.

ridges

The youngest rocks in the ocean floor are locacted at the mid-ocean _______________.

Harry Hess

The seafloor spreading theory was proposed by ___________ __________.

divergent

Plate move apart at _____________ boundries.

convergent boundries

The places between plates moving together are called_____________ ____________.

earthquakes

Where plates slide past one another, __________ occur.

younger than

Ocean floor rocks are _____________ ____________ continental rocks.

Pangaea

The lack of explination for continental drift prevented many scientents from believing a single supercontinent called _____________once existed.

reversal

Studying the ocean floor, scientists found rocks showing magnetic _________________.

subduction zones

Oceanic plates are pushed down into the upper mantle in __________________.

fossils and rocks

The presence of the same ___________ __________ on several continents supports the idea of continental drift.

hot, dense material below Earth's surface is forced upward

Seafloor spreading occurs because ______________________________________________________________.

rift valleys & plate boundries

The results of plate movement can be seen at ________________________.

convection current

The cycle of heating, rising, cooling and sinking is called________________ _________________.

samples of rock from different locations

Scientists aboard the Glomar Challenger added to the evidence for the theory of seafloor spreading by providing _____________________.

Himalayas

The ________________ are forming where the Indo-Australian plates collides into the Eurasian plate.

continental drift

The hypothesis that continents have moved slowly to their current locations is called ______________ ____________.

mountains, volcanoes, ocean basins

As Earth's plates move apart at some boundaries, they collide at others, forming___________,_______________,__________________________.

seafloor spreading

Continental drift occurs because of ____________ _______________.

magnetic field

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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