Vocabulary
The thinnest layer of the Earth
What is the crust
There are ______________ main layers of the Earth.
What is four
This scientist started the idea of the Continental Drift Theory
Who is Alfred Wegener
Earthquakes and volcanoes are usually located along the edges of the _____________.
What is a plate boundary
The Himalayan mountains are the result of a ___________________________ plate boundary.
What is convergent 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.
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
The Great African Rift Valley was formed as a result of a ___________ plate boundary.
What is divergent?
The theory that all continents are fragments of Pangaea now drifting apart
What is the Continental Drift Theory
Plates float on top of the _______________________.
What is the asthenosphere
The supercontinent of ____________ was formed many millions of years ago.
What is Panaega?
Name the tectonic plate where the majority of the United States is located.
What is the NOrth American plate?
_________________ are a result from the build up of pressure or stress at a plate boundary.
What is earthquakes
States that youngest rocks of ocean floor are at divergin 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
Besides fossils, give another piece of evidence that supports copntinental drift.
What is similar mountain ranges or same rock formation?
______________ cause the plates to move on the asthenosphere.
What are convection currents?
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 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)
The theory that the Atlantic Ocean is getting larger is a result of ________________.
What is seafloor spreading?