Seafloor spreading
The act of plates moving away by the adding of rock in the ocean.
What is Seafloor spreading
A massive landform with all continents.
What is pangea?
Proves Seafloor Spreading
What is Polarity Magnets
two tectonic plates move away from each other with a volcanic trench in the middle.
What is a divergent plate boundary.
a force that results from denser oceanic plates sinking beneath less dense continental plates along convergent boundaries and subduction zones
what is a slab pull?
different magentics in seafloor spreading
How can people tell seafloor spreading exists?
Who originally came up with Continental Drift?
Peter Perigrinus of France
Who first proposed the Idea of polarity magnets.
Where tectonic plates converge, a plate capped by thin oceanic crust descends (subducts) beneath a plate with much thicker continental crust.
What is a convergent plate boundry?
How many plates are on earth?
The mid Atlantic ridge
What is a real life example of Seafloor spreading.
Laurasia and Gondwana
What are the two supercontinents that make up pangea?
Every 200,000-300,000 years
How often do the poles switch?
places where plates slide sideways past each other
Transform boundaries.
the sideways and downward movement of the edge of a plate of the earth's crust into the mantle beneath another plate.
What is subduction?
1960
When was seafloor spreading discovered?
Noah's Ark
What story in the Bible agrees with Continental Drift.
the 13th century
When was Polarity magnets first discovered?
divergent plate boundary, transform plate boundary, convergent plate boundary
What are Plate boundaries?
solid, outer part of Earth
What is the lithosphere?
Harry Hess
Who proposed the idea of seafloor spreading?
200 million years ago
How many years ago do most scientists say Pangea was still together?
They both prove each other
What is relationship between Polarity magnets and seafloor spreading?
Earthquakes
What do convergent boundaries cause?
What is plate tectonics.