Vocabulary
The thinnest layer of the Earth
What is the crust
There are ______________ main layers of the Earth.
What is four (crust, mantle, inner and outer 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 a ___________________________ boundary.
What is convergent boundary
The thickest layer of the Earth
What is the mantle.
Evidence of matching animal fossils from two separate continents _____________________ 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
Plates float on top of the _______________________.
What is the asthenosphere
Evidence of tropical plants were found on this continent
What is Antarctica
When two plates come together
What is convergent
_________________ are a result from the build up of stress at a plate boundary.
What is earthquakes
States that youngest rocks of ocean floor are at diverging 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
The super-continent that existed 250 million years ago
What is Pangea
This is the mechanism (what causes) the plates to move
What is convection currents in the mantle
The San Andreas Fault in California is an example of a ____________________ boundary.
What is a transform boundary
Although the hottest layer of the Earth, this layer is solid metal
What is the inner core
The Earth's crust is more dense under the _____________________ and less dense under the _____________________.
What is more dense under the ocean and less dense under the continents.
Continental Drift Theory was not accepted as a theory because it did not explain this
What is how the continents moved (seafloor spreading)
The two types of convergent boundaries
What is subduction (where volcanoes often occur) and collision (where mountains are usually formed)
When oceanic crust sinks underneath continental crust this process creates volcanic mountains like the Andes Mountains.
What is subduction (convergent subduction)?