Show:
sea-floor spreading
plate tectonics
definition's
layers of the earth
Wegner
100
where does sea-floor spreading take place
at mid ocean ridges
100

In what units are tectonic plate movements measured

centimeters a year

100

the boundary between two tectonic plates that are moving away from each other

divergent boundary

100

the hottest layer of the earth

inner core

100

what was Alfred Wegener's theory

that all continents were once all connected

200
during the process of sea-floor srpreading when the knew crust starts to form where does the old crust go
farther away from the mid-ocean range
200

The movement of a _________ plate and a ________ plate _________(toward, away from, sideways against ) each other forms mountain ranges.

Continental, continental, toward

200

Earthquakes usually begin at what part of a tectonic plate?

Fault 

200

The layer of Earth below the athenosphere

Mantle

200

What was the name Wegner gave to his large single continent?

Pangaea

300

in sea-floor spreading how does new crust form

molten material comes up through the gap formed by the divergent boundary and hardens into new crust

300

What do you call movements of tectonic plates toward each other

Convergent 

300

a place on earth's surface that is directly above a column of rising magma called a mantle plum

hot spot

300

the layer of the earth we walk on

crust/lithosphere

300

What woman cartographer finally showed Wegner's theory to be correct?

Marie Tharp

400

what is sea floor spreading

the process by which new oceanic lithosphere is created at mid-ocean ridges as older materials are pulled away from the ridge

400

what is divergent boundary

tectonic plates sliding past each other

400
a deep crack that forms between tectonic plates as they separate
rift
400
the soft layer of the earth
asthenosphere
400

why did scientist not accept Wegener's theory at first

they didnt think any force of nature could move entire continents

500

what are "pillow" lava 

lava that comes through the crust and cools so rapidly that the inner rock is still molten after the outside cools

500

what is subduction zone

the region where an oceanic plate sinks down into the asthenosphere at a convergent boundary usually between continental and oceanic plates

500

a break in the earth's crust along which blocks of the crust slide relative to one another due to tectonic forces

fault

500
1st layer of the earth
lithosphere
500

what evidence did Wegener have to prove his theory about Continental Drift

fossil evidence and the matching continent outlines when put together in their original arrangement