There are ______________ main layers of the Earth.
What is four
100
Created the Continental Drift Theory
Who is Alfred Wegener
100
Earthquakes and Volcanoes are usually located in relation to these
What is a plate boundary
100
Mountains are the result of a ___________________________ boundary.
What is convergent boundary
200
A number of rigid, but moving, pieces of Earth's surface
What is tectonic plates.
200
The thickest layer of the Earth
What is the mantle.
200
These are the two plates that have little to no land on them?
What are Pacific Plate and Nazca Plate
200
The mid-ocean ridge is an example of a ____________________ boundary and occurs here where new ocean floor is formed.
What is divergent boundary.
200
Hot air or hot liquid is less ________________ than cool air or liquid, which is why it rises
What is dense
300
The theory that all continents are fragments of Pangaea now drifting apart
What is the Continental Drift Theory/Tectonic Plate Theory
300
Plates float on top of the _______________________.
What is the asthenosphere
300
This plate is the only one that is always in the same general location on the globe
What is Antarctica
300
Name four of the major plates
What is any of the following North American plate, South American plate, Eurasian Plate, Indo-australia plate, African plate, Antarctica plate, Pacific Plate, Nazca Plate
300
_________________ are a result from the build up of stress at a plate boundary.
What is earthquakes
400
The youngest rocks of ocean floor are at divergent boundaries, moving outward, creating this ....
What is an ocean basin
400
The rigid part of the Earth including the crust and the upper mantle (makes up the plates of the Earth)
What is the lithosphere
400
Pangaea is this
What is a supercontinent
400
This is the mechanism (what causes) the plates to move
What are convection currents in the mantle
400
The San Andreas Fault in California causes earthquakes and is an example of a ____________________ boundary.
What is a transform boundary
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 ___________crust and thickest under the ______________crust.
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
The two types of convergent boundaries
What is subduction (where volcanoes often occur) and collision (where mountains are usually formed)
500
This person used sonar to map the bottom of the ocean and discovered the mid-ocean ridge in the Atlantic Ocean.