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Plate tectonics
seafloor spreaading
19
Science
8th Grade
09/29/2009

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Term
Alfred Wegner
Definition
a german meteorologist who thought that the fit of the continents
Term
continental drift
Definition
Wegners hypothesis that all continents were once connected
Term
Pangaea
Definition
large landmass that was composed of all the continents joined together
Term
Mesosaurus
Definition
a reptile fossil found in South America and Africa
Term
Glossopteris
Definition
a plant fossil found in Australia, India, Antarctica, Africa
Term
Seafloor Spreading
Definition
Hess's theory that new seafloor is formed when magma is forced upward
Term
Glomar Challenger
Definition
1968, ship allowed scientists to drill into the seafloor
Term
magnetometer
Definition
to detect magnetic fields, so scientists could find rocks at the bottom of the ocean
Term
plate tectonics
Definition
theory that earth's crust and upper mantle are broken into plates that "float" around the mantle.
Term
plates
Definition
a large section of earths oceanic crust and upper mantle.
Term
lithosphere
Definition
rigid layer of Earth about 100 km thick made of the crust
Term
asthenosphere
Definition
plastic-like layer of earth on which the lithosphere plates float and move around
Term
divergent boundary
Definition
The boundary between two plates that are moving apart
Term
convergent boundary
Definition
when two plates move together
Term
subduction zone
Definition
where oceanic plates margin in being pushed under a continental plate
Term
transform boundary
Definition
where two plates slide against each other in a sideways motion
Term
convection current
Definition
entire cycle of heating, rising, cooling, and sinking
Term
tension force
Definition
when the force grabs onto eachother in opposite sides
Term
compression force
Definition
a pressure that attempts to flatten a material
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