Pangaea
What is Pangaea?
What is a supercontinent, one large landmass, one big continent.
What is continental drift?
The idea that a single land mass broke up to form smaller land masses.
What is seafloor spreading?
New ocean crust is formed, while old ocean crust is pulled away.
Where does plate movement occur?
In the mantle.
There are holes in the earth's crust, what are these holes called?
hotspots
How many continents do we have?
7
Who came up with the idea of continental drift?
Alfred Wegener
What layer of the Earth is the magma located?
in the mantle.
Which type of stress is happening when two plates are moving together?
convergent boundaries.
Where do volcanoes occur?
where the plates meet
Which 2 continents look like they fit together like a puzzle piece?
South America and Africa
What did the smaller land masses create?
The continents we have today.
What happens to the magma as it hits the cold ocean water?
it is cooled and turned into new ocean crust.
Which type of stress cause earthquakes?
Transform plate boundary.
What is another name for trench?
subduction zone
Alfred Wegener
Name 1 theory that Wegener had about continental drift.
puzzle pieces, similar fossils on different continents, mountain ranges, and climate zones.
What is the third step in the seafloor spreading process?
Which type of stress is happening when two plates move apart?
Divergent boundaries.
Why do trenches form?
lighter continental plate overrides oceanic plate.
Name the 7 continents
Name 2 theories, that haven't been named, that Wegener had about continental drift?
puzzle pieces, similar fossils on different continents, mountain ranges, and climates zones.
What type of current moves the crust sideways and away from the ocean ridge?
Convection current
During what type of stress do mountains occur?
convergent boundaries
What happens in the hotspots during a volcano?
cooler oceanic crust falls to the bottom of the mantle forcing magma to rise to the surface.