Alfred Wagner
What was the super continent called that Alfred Wegner proposed existed 335mya?
What is Pangea
Plate Tectonics move each year. But how much do they move each year?
Plate move about 1-1.5 inches yearly
Sea Floor Spreading occurs where?
At mid ocean ridges.
Transform plate boundaries move _____________
past each other
Mid ocean ridges form at what type of boundary
divergent boundary
Mountain ranges in the middle of the ocean are called
mid ocean ridges
This is defined as a cold and rigid outermost rock layer
lithosphere
The further away from the mid-ocean ridge, the _____ the rocks.
Older
What happens at the boundary where continental/oceanic plates converge?
The Oceanic plate subducts under the Continental plate
What are the 2 types of crusts
oceanic and continental
What theory did Alfred Wegner come up with?
What is continental drift
Which layer of Earth do the Plate Tectonics glide on?
The plates glide on the asthenosphere
Sea Floor Spreading is...
Sea Floor Spreading is when the sea floor spreads away so magma rises to the surface to take its place.
These type of boundaries have no volcanoes
Transform
What boundary is located at the San Andreas Fault line?
Transform Boundary
The mountain range in Europe called the Caledonian and what one in North American are similar in age and structure
Appalachian Mountains in North America
What causes Plate Tectonics to move?
Movement of the plates is due to the convection currents located in the mantle
What is found at divergent boundaries on land?
Rift Valleys
What happens at an oceanic and oceanic convergent boundary
Deep ocean trench
What type of plate boundary results in the creation of Mountains?
convergent boundaries
Why didn't geologists and other scientists believe his theory of Continental Drift?
There was no evidence at the time to support his theory
What is the ring of fire?
The Ring of Fire is a 25,000-mile horseshoe-shaped belt (not a perfect circle) surrounding the Pacific Ocean, stretching from the tip of South America to New Zealand
450 smoking volcanoes and experiencing 90% of the world's earthquakes
When Sea Floor Spreading occurs what comes in place of the open floor?
Very hot magma comes to the surface and cools.
What occurs at 2 oceanic plates when one is older than the other one?
The older oceanic will subduct under the younger
deep ocean trench with a line of volcanoes
What evidence is proof of Continental Drift
Fossil Evidence, Mountain Ranges identical across different continents, puzzle-like fit, climate/glacial grooves evidence, rock clues