Vocabulary
The thinnest layer of the Earth
What is the crust?
The consistency of the mantle can best be described as
Silly putty, slime, fluid (not liquid,not solid)?
Created the Continental Drift Theory
Who is Alfred Wegener?
Earthquakes and Volcanoes are usually located in relation to these
What is a plate boundary?
The Himalayan mountains are the result of a ___________________________ boundary.
What is a convergent collision boundary?
A number of rigid, but moving, pieces of Earth's surface
What is tectonic plates?
The thickest layer of the Earth
What is the mantle?
These two continents most obviously fit together like a puzzle _____________________ and _____________________
What is Africa and South America?
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?
Plates float on top of the _______________________. This is a more technical term for the mantle.
What is the asthenosphere?
Evidence of tropical plants were found on this continent which is no longer tropical
What is Antarctica?
At what boundary types are the plates cycled?
Divergent and Convergent Subduction?
_________________ are a result from the build up of pressure/stress at a plate boundary.
What is earthquakes?
States that youngest rocks of ocean floor are at divergent boundaries, moving outward
What is seafloor spreading?
The scientific name for the rigid part of the Earth including the crust and the upper mantle (makes up the plates of the Earth).
What is the lithosphere?
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?
Volcanic island that forms in the middle of a plate.
What is a hot spot?
The Earth's crust is thinnest under the _____________________ and thickest under the _____________________.
What is thinnest under the ocean and thickest under the continents?
Continental Drift Theory was not accepted because it did not explain this
What is how the continents moved?
The two types of convergent boundaries
What is subduction (where volcanoes often occur) and collision (where mountains are usually formed)?
Harry Hess mapped the ocean floor and discovered
What is the Mid-Ocean Ridge?