Earths layers
The thinnest layer of the earth...
The crust
what happens at divergent boundaries...
subduction zone and mid-ocean ridge
what was the theory about how the continents looked...
they all look like puzzle pieces
what was the theory about Pangea...
that all the continents were once formed to create a supercontinent.
how many years ago was Pangea created...
200 million years ago
what are the 2 crusts called
Continental, Oceanic
whats happens at convergent boundaries...
Mountains, volcanoes, trenchs
what plate are we sitting on right now...
North American
what evidence about Pangea and mesasaurus do we have...
that the mesasaurus fo
how many layers of earth are there...
4
what moves in the middle mantle...
convection currents
what happens at transform boundaries...
faults and earth quakes
what do the plates sit on...
asthenosphere
what evidence do we have to back up about finding mesasuarus fossils on two different continents...
that the mosasaurs cant swim far distances
whats the thickest layer of the earth...
the mantle
what layer is made of liquid?
outer core
who discovered plate motion?
Alfred Wagner
what are the 3 boundaries called...
convergent, divergent, transform.
what 2 continents did the mesasaurus fossils end up on...
South America and Africa
whats the thinnest layer of the earth...
crust
whats the hottest layer...
inner core
what do scientists use to study the plate motion?
hydrophones and tracking earthquakes and volcanoes.
Name four of the major plates...
North American plate, South American plate, Eurasian Plate, Indoaustralia plate, African plate, Antarctica plate.
where tropical plants found...
in Antarctica
Plates float on top of the...
asthenosphere