Plate Tectonics

Good

100

Alfred Wegener proposed this hypothesis

Continental drift

200

Ocean crust is produced here

at the mid-ocean ridge

300

Scientists used these technologies to develop the theory of seafloor spreading

echo-sounding, magnetometer, and seafloor thickness measurements

400

Scientists found glacial features associated with a cooler climate here, which supported the theory of Pangea's existance

South America

500

Mid-ocean ridges are associated with this

divergent plate boundaries

Luck

100

Two plates with equal densities form mountain ridges here

continent-to-continent convergent boundaries

200

Plates moving away from each other are called

divergent boundaries

300

Earth's magnetic field does this over time

changes polarity

400

This layer of Earth contains the crust and upper mantle

asthenosphere

500

The oldest seafloor on the Atlantic Ocean is near the edge of the continents; this is how it can tell us about when North America started to separate from Europe

If we know age of oldest oceanic crust and relative rate of seafloor spreading

On

100

Sonar technology strengthened the theory of plate tectonics in this way

sonar technology maps the seafloor, and mid-ocean ridge discovered

200

Satellite technology supports the theory of Plate Tectonics in this way

, satellites proved that plates moved,

300

seismic data supports the theory in this way

seismic data explain convection currents in mantle,

400

polarity and age of rocks exposed on seafloor helped to discovery of this

 seafloor spreading

500

Sediments found in Africa normally found in cold climates are explained by what

continental drift

The

100

Slabs of crust and upper mantle are these

tectonic plates

200

Plates slide past each other at this kind of plate boundary

transform

300

The puzzle-like fit of the coastline suggests what

that the continents were once joined

400

Name of the supercontinent

Pangea

500

This causes tectonic plates to move

convection in the mantle

Test

100

This force occurs at a convergent plate boundary

slab pull

200

Finding Glossopteris on several different continents supports this idea

that a giant landmass existed near the equator about 250 mya--(continental drift)

300

two plates separate in this kind of boundary

divergent

400

Many California earthquakes are caused by this

two plates sliding past one another

500

This is where oceanic crust would be expected to be hottest

mid-ocean ridge