Drifting Continents
______ ______ came up with the Continental Drift Theory
Who is Alfred Wegener?
This sonar device is used to detect minute changes in magnetic fields.
What is a Magnetometer?
These are huge pieces of crust and upper mantle that cover the earth
What are tectonic plates?
This is where large-scale motion occurs.
What is the Mantle
This up and down flow produces a pattern called ______________
What are Convection Currents
This is the name of the former super-continent.
What is Pangaea
Sonar's main use is this
What is measuring water depth and topography of the ocean floor?
These are the three types of boundaries
Cooled matter sinks and ______ in density. Warmed matter rises and ______ in density.
What is Increases; Decreases?
This is the age of the oldest part of the seafloor.
What is 180 million years old?
The Appalachian Mountain range continues through these two countries.
What are the British Isles, and Scandinavia?
This trench is the deepest trench in the world
What is the Mariana Trench?
This is what it's called when plates pull apart on land.
What are Rift Valleys?
Rising material ____ and ____ the Lithosphere at Divergent Boundaries.
These are the three types of convergent boundaries.
What are Oceanic-Oceanic, Oceanic-Continental, and Continental-Continental?
Wegener's theory was rejected for these two reasons.
What are explanations for how continents move and what moves them?
These form the longest continuous mountain range
What are ocean ridges?
This happens when the denser plate descends under the less dense plate.
What is Subduction?
This occurs where the Divergent Plate Boundaries push outward.
What is Ridge Push?
This is a side affect of Transform Boundaries.
What are Fault Lines?
These five things are major proof that Pangaea existed.
What are Glacial deposits, Coal deposits, Climate, Fossils, and Rock Formations?
This happens as the magma solidifies in the gap a small amount of new ocean floor is added to the surface.
What is Seafloor Spreading?
This is the Convergent boundary that occurs when Island chains are formed.
What is Oceanic-Oceanic?
This occurs where plates are subducted and pulled down in the Convergent Plate Boundaries.
What is Slab Pull?
These were the five continents that the fossil Glossopteris was found on.
What is South America, Australia, Africa, India, and Antarctica?