Vocabulary
The thinnest layer of the Earth
What is the Crust ?
There are ______________ main layers of the Earth.
What is Four ?
Continental Drift Theory was not accepted because it did not explain this
What is how the continents moved ?
Earthquakes and Volcanoes are usually located in relation to these
What is a plate boundary ?
Hot air or liquid is less ________________ than cool air or liquid.
What is dense ?
A number of rigid, but moving, pieces of Earth's surface
What is Tectonic Plates ?
Plates float on top of the _______________________.
What is the Asthenosphere ?
Evidence of matching animal fossils from two separate continents _____________________ and _____________________
What is Africa and South America ?
This is the mechanism (what causes) the plates to move
What is convection cycles in the mantle ?
This person used sonar to map the bottom of the ocean and discovered the mid-ocean ridge in the Atlantic Ocean.
Who is Harry Hess ?
The theory that all continents are fragments of Pangaea now drifting apart
What is the Continental Drift Theory ?
The thickest layer of the Earth
What is the Mantle ?
Created the Continental Drift Theory
Who is Alfred Wegener ?
The two types of convergent boundaries
What is subduction ?
_________________ are a result from the build up of stress at a plate boundary.
What is earthquakes ?
States that youngest rocks of ocean floor are at divergin boundaries, moving outward
What is Seafloor Spreading ?
The rigid part of the Earth including the crust and the upper mantle (makes up the plates of the Earth)
What is the Lithosphere ?
Evidence of tropical plants were found on this continent
What is Antarctica ?
The mid-ocean ridge is an example of a ____________________ boundary and ___________________ occurs here where new ocean floor is formed.
What is divergent boundary; sea-floor spreading ?
The San Andreas Fault in California is an example of a ____________________ boundary.
What is a transform boundary ?
Although the hottest layer of the Earth, this layer is solid metal
What is the Inner Core ?
The Earth's crust is thinnest under the _____________________ and thickest under the _____________________.
What is thinnest under the ocean and thickest under the continents ?
Pangaea existed this many millions of years ago
What is around 250 million years ago ?
Name four of the major plates
What is the North American plate, South American plate, Eurasian Plate, Indoaustralia plate, African plate, Antarctica plate ?
The Himalayan mountains are the result of a ___________________________ boundary.
What is convergent boundary ?