Vocabulary
The thinnest layer of the Earth
the crust
There are ______________ main layers of the Earth.
Three
Created the Continental Drift Theory
Alfred Wegener
Earthquakes and Volcanoes are usually located in relation to these
plate boundary
The Himalayan mountains are the result of a ___________________________ boundary.
What is convergent boundary
A number of rigid, but moving, pieces of Earth's surface
tectonic plates.
The thickest layer of the Earth
mantle.
Evidence of matching animal fossils from two separate continents supports what theory.
Continental drift
The mid-ocean ridge is an example of a ____________________ boundary and
divergent boundary
Hot air or liquid is less ________________ than cool air or liquide
What is dense
The theory that all continents are fragments of Pangaea now drifting apart
the Continental Drift Theory
Plates float on top of the _______________________.
asthenosphere
Evidence of tropical plants were found on this continent
What is Antarctica
Name four of the major plates
any of the following North American plate, South American plate, Eurasian Plate, Indoaustralia plate, African plate, Antarctica plate
_________________ are a result from the build up of stress at a plate boundary. They produce seismic waves.
earthquakes
The movement caused within a fluid by the tendency of hotter and therefore less dense material to rise, and colder, denser material to sink under the influence of gravity, which consequently results in transfer of heat.
convection
The rigid part of the Earth including the crust and the upper mantle (makes up the plates of the Earth)
lithosphere
Pangaea existed this many millions of years ago
What is around 250 to 300 million years ago
This is the mechanism (what causes) the plates to move
convection cycles in the mantle
The San Andreas Fault in California is an example of a ____________________ boundary.
transform boundary
Although the hottest layer of the Earth, this layer is solid metal
inner core
The Earth's crust is thinnest under the _____________________ and thickest under the _____________________.
The Earth's crust is thinnest under the __________ocean____ and thickest under the ________continents _____.
Continental Drift Theory was not accepted because it did not explain this
how the continents moved
What land features can you find at convergent boundaries
subduction= (where volcanoes often occur)
collision =(where mountains are usually formed)
What type of boundary is the East Pacific Ridge? What are the two plates on both sides?
Divergent plate boundary.
Pacific and Antarctic plate