Continental Drift
Man who first proposed that the continents are moving
Alfred Wegener
What is the name of the theory that combines the ideas of continental drift and seafloor spreading and is used to explain many of the the things that exist on Earth.
Plate Tectonics
The 2 ways mountains are formed.
Faulting & Folding
A __________ ________ is one where two of Earth’s plates are moving apart.
Diverging boundary
Molten rock material that is released by a volcano.
Lava
How does the shape of the continents support the idea of continental drift?
They fit together like a big puzzle indicating they once were together.
Two plates with continental crust move up against each other. They crush together to form huge mountain ranges.
Convergent Boundaries
When plates collided, strong forces made rocks bend and break causing
Folds
Lava flows from the ridge to form new ________ ______.
Oceanic crust
The two types of plate boundaries where volcanos are not found.
Transform and Convergent
How does the fossil record support the concept of continental drift?
As we look at older and older fossils from different continents we see them become more and more alike until we reach a point where they are identical.
Divergent plate boundaries form these ocean features.
Midocean ridges
Mountains that are formed by a series of large scale anticlines and synclines.
Folded Mountains
Plates slide sideways past each other. But this sliding doesn’t take place smoothly. The rocks bind and catch on each other, causing earthquakes.
Transform boundaries
Most volcanoes form where we find these features formed by oceanic crust.
Subduction
What theory was developed and explained how the continents moved?
Seafloor spreading
The type of plate boundary occurs when plates slide past each other.
Transform boundaries
Anticline and Syncline fold which way?
A-Upwards
S- downwards
These are the slowest earthquake waves and do not travel very far.
Surface or L waves
“floats” on the partly melted layer of the mantle below the lithosphere.
Tectonic plates
What is the name of the supercontinent
What is Pangea
Earthquakes occur and the continental crust is pushed up to form mountains. The subducted plate melts deep underground, and the molten rock can rise to the surface, creating volcanoes.
Subduction
This type of force forms normal faults.
Tension from plates moving past each other
These ocean waves are often triggered by earthquakes on the seafloor.
Tsunamis
What country/Island is made up of ocean floor that we can see today.