Vocabulary
sea-floor spreading begins here when magma is released and hardens from this
What is a mid-ocean ridge
The oldest sea-floor is closest to this
What is a deep-ocean trench
Created the Continental Drift Theory
Who is Alfred Wegener
Earthquakes, volcanoes, and mountains are usually located in relation to these
What is a plate boundary
The Himalayan mountains are the result of a ___________________________ boundary.
What is convergent boundary
A number of rigid, but moving, pieces of Earth's surface
What is tectonic plates.
Convection takes place in this layer of Earth
What is the mantle.
the super continent that was made up of all the continents
What is Pangaea
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
Hot air or liquid is less ________________ than cool air or liquid
What is dense
The theory that all continents are fragments of Pangaea now drifting apart
What is the Continental Drift Theory
Youngest or newest sea-floor is closest to this
What is a mid-ocean ridge
Evidence of tropical plants were found on this continent
What is Antarctica
The three type of plate boundaries
What is convergent, divergent, and transform?
_________________ are a result from the build up of stress at a transform boundary.
What is earthquakes
This theory states that the youngest rocks of ocean floor are at divergent boundaries, moving outward
What is theory of seafloor spreading
These can be formed at convergent boundaries
what are mountains or volcanoes
Pangaea existed this many millions of years ago
What is around 250 million years ago
This is the mechanism (what causes) the plates to move
What is convection cycles in the mantle
The San Andreas Fault in California is an example of a ____________________ boundary.
What is a transform boundary
The process by which the ocean floor sinks beneath a deep-ocean trench and back into the mantle again is called.
What is subduction
Where pieces of Earth's crust diverge or move apart on land
What is a rift valley
Continental Drift Theory was not accepted because it did not explain this
What is how the continents moved
Subduction happens during this type of plate boundary
what is convergent
This person used sonar to come up with the theory of sea-floor spreading.
Who is Harry Hess