The thinnest layer of the Earth
What is the crust?
There are ______________ main layers of the Earth.
What are four?
The "supercontinent" before Pangaea.
What is Rodinia?
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?
Evidence of matching animal fossils from two separate continents _____________________ and _____________________
What is Africa and South America?
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 _______________________.
What is the asthenosphere?
The plant fossil found in both South Africa and Australia.
What is Glossopteris?
_________________ are result from the build up of 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 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
When was around 250 million years ago
This is the mechanism (what causes) the plates to move
What is convection current
The period when the "supercontinent" is divided into two big landmasses.
What is Triassic Period?
The continental feature formed by a hotspot located in North America
What is Yellowstone Caldera?
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? or What are the forces that makes the continents move?
The most active volcano found in Hawaii
What is Mount Kilauea
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?