plate tectonics
Earthquakes and Volcanoes are usually located in relation to these
plate boundary
There are ______________ main layers of the Earth.
four
The thinnest layer of the Earth
crust
Created the Continental Drift Theory
Who is Alfred Wegener
The mid-ocean ridge is an example of a ____________________ boundary and ___________________ occurs here where new ocean floor is formed.
divergent boundary
The thickest layer of the Earth
mantle
A number of rigid, but moving, pieces of Earth's surface
What is tectonic plates.
Evidence of matching animal fossils from two separate continents _____________________ and _____________________
What is Africa and South America
Name four of the major plates
What is any of the following North American plate, South American plate, Eurasian Plate, Indoaustralia plate, African plate, Antarctica plate
Plates float on top of the _______________________.
asthenosphere
The theory that all continents are fragments of Pangaea now drifting apart
What is the Continental Drift Theory
Evidence of tropical plants were found on this continent
What is Antarctica
This is the mechanism (what causes) the plates to move
What is convection cycles in the mantle
The rigid part of the Earth including the crust and the upper mantle (makes up the plates of the Earth)
lithosphere
States that youngest rocks of ocean floor are at divergin boundaries, moving outward
What is seafloor spreading
Pangaea existed this many millions of years ago
What is around 250 million years ago
The two types of convergent boundaries
What is subduction (where volcanoes often occur) and collision (where mountains are usually formed)
The Earth's crust is thinnest under the _____________________ and thickest under the _____________________.
What is thinnest under the ocean and thickest under the continents.
Although the hottest layer of the Earth, this layer is solid metal
What is the inner core
Continental Drift Theory was not accepted because it did not explain this
What is how the continents moved