Good
Alfred Wegener proposed this hypothesis
Continental drift
Two plates with equal densities form mountain ridges here
continent-to-continent convergent boundaries
Sonar technology strengthened the theory of plate tectonics in this way
sonar technology maps the seafloor, and mid-ocean ridge discovered
Slabs of crust and upper mantle are these
tectonic plates
This force occurs at a convergent plate boundary
slab pull
Ocean crust is produced here
at the mid-ocean ridge
Plates moving away from each other are called
Satellite technology supports the theory of Plate Tectonics in this way
, satellites proved that plates moved,
Plates slide past each other at this kind of plate boundary
transform
Finding Glossopteris on several different continents supports this idea
that a giant landmass existed near the equator about 250 mya--(continental drift)
Scientists used these technologies to develop the theory of seafloor spreading
echo-sounding, magnetometer, and seafloor thickness measurements
Earth's magnetic field does this over time
changes polarity
seismic data supports the theory in this way
seismic data explain convection currents in mantle,
The puzzle-like fit of the coastline suggests what
that the continents were once joined
two plates separate in this kind of boundary
divergent
South America
This layer of Earth contains the crust and upper mantle
asthenosphere
polarity and age of rocks exposed on seafloor helped to discovery of this
seafloor spreading
Name of the supercontinent
Pangea
two plates sliding past one another
Mid-ocean ridges are associated with this
divergent plate boundaries
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
Sediments found in Africa normally found in cold climates are explained by what
continental drift
This causes tectonic plates to move
convection in the mantle
This is where oceanic crust would be expected to be hottest
mid-ocean ridge