There are ______________ types of plate boundaries.
What is three- convergent, divergent, and transform
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
The Himalayan 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
When two plates move together or towards each other that is a ________________ boundary
What is convergent.
200
Evidence of matching animal fossils from two separate continents _____________________ and _____________________
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 boundary; sea-floor spreading
200
Hot air or liquid is less ________________ than cool air or liquid
What is dense
300
The theory that all continents are fragments of Pangaea now drifting apart
What is the Continental Drift Theory
300
Plates float on top of the _______________________.
What is the mantle
300
Evidence of tropical plants were found on this continent
What is Antarctica
300
Where an oceanic plate and a continental plate meet creates a _____________________ and as a result of of on plate being pushed under it forms a _________________.
What is a Volcano, Trench
300
_________________ are a result from the build up of stress at a plate boundary.
What is earthquakes
400
This evidence shows that the youngest rocks of ocean floor are at diverging boundaries, moving outward
What is seafloor spreading
400
The densest type of plate crust is?
What is oceanic
400
What piece of evidence Wegener missing to prove that the continents were moving.
What is sea floor spreading
400
This is the mechanism (what causes) the plates to move
What is convection cycles in the mantle
400
The San Andreas Fault in California is an example of a ____________________ boundary.
What is a transform boundary
500
When hot material in the mantle rises to the surface and the cooler more dense material sinks down this is called
Convection Currents
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
The two types of convergent boundaries
What is subduction (where volcanoes often occur) and collision (where mountains are usually formed)
500
Creates Island chains and is not necessarily at a plate boundary.