Vocabulary
The thinnest layer of the Earth
What is the crust?
The number of layers (main) of Earth.
What is four? (crust, mantle, outer core, inner core)
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 this type of boundary.
What is convergent boundary?
A number of rigid, but moving, pieces of Earth's surface
What are tectonic plates?
The thickest layer of the Earth
What is the mantle?
Two continents were evidence of matching animal fossils were found.
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 and 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 Theory of Continental Drift?
This is where tectonic plates float
What is on the asthenosphere?
Evidence of tropical plants were found on this continent
What is Antarctica?
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?
These result from the build up of stress at a plate boundary.
What are earthquakes?
States that youngest rocks of ocean floor are at divergent boundaries, moving outward
What is seafloor spreading?
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 are convection cycles in the mantle?
The San Andreas Fault in California is an example of this type of boundary.
What is a transform boundary?
Although the hottest layer of the Earth, this layer is solid metal
What is the inner core?
Where Earth's crust is thinnest and thickest.
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)?
This person used sonar to map the bottom of the ocean and discovered the mid-ocean ridge in the Atlantic Ocean.
Who is Harry Hess?