There are ______________ main layers of the Earth.
What is four
100
Created the hypothesis of Continental Drift
Who is Alfred Wegener
100
Earthquakes and Volcanoes are usually located in relation to these
What are plate boundaries
100
The Himalayan mountains are the result of a ___________________________ boundary.
What is convergent
200
A number of rigid, but moving, pieces of Earth's surface
What are tectonic plates.
200
The thickest layer of the Earth upon which the crust moves
What is the mantle.
200
Wegener used evidence of matching animal fossils from these two separate continents that fit together like puzzle pieces.
What is Africa and South America
200
The mid-ocean ridge is an example of a ____________________ boundary and ___________________ occurs here where new ocean floor is formed.
What is divergent; sea-floor spreading
200
Hot air or hot liquid is less ________________ than cool air or cool liquid
What is dense
300
The idea that all continents are fragments of Pangaea now drifting apart
What is the Continental Drift Hypothesis
300
There are this many major tectonic plates.
What is 7.
300
Evidence of tropical plants were found on this continent by Wegener
What is Antarctica
300
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
300
_________________ are a result from the sudden release of build up of stress at a plate boundary.
What are earthquakes
400
States that youngest rocks of ocean floor are at divergent boundaries, moving outward
What is seafloor spreading
400
The longest mountain ranges in the world are found here.
What are mid-ocean ridges
400
Pangaea existed this many millions of years ago
What is around 300 million years ago
400
This is the mechanism that causes the plates to move
What are convection currents in the mantle
400
The San Andreas Fault in California is an example of a ____________________ boundary.
What is a transform or lateral
500
Although the hottest layer of the Earth, this layer is solid metal
What is the inner core
500
The Earth's crust is thinnest under the _____________________ and thickest under the _____________________.
What is thinnest under the ocean and thickest under the continents.
500
Continental Drift Theory was not accepted because it did not explain this
What is how the continents moved
500
Convergent boundaries result in the formation of _____________ & _____________ in oceans, and ________________& ____________ on land.
What are deep ocean trenches & volcanoes (subduction between 2 oceanic crusts), and mountains & earthquakes (little to no subduction between 2 continental crusts).
500
This provides some of the strongest evidence for sea floor spreading.