Earth Layers
The rigid outer shell Earth; Oceanic and Continental
What is the crust?
When two plates move apart.
What is a divergent plate boundary?
When 2 plates collide, the denser plate descends below the other less-dense plate.
What is subduction?
The area from the surface of the earth down to its center.
What is the Geosphere?
Supercontinent, the words means all earth.
What is Pangaea?
The solid area below the crust that has some melting. Where the asthenosphere is located.
What is the upper mantle?
When two plates come together.
What is a convergent plate boundary?
Described by the shapes of the continents appearing as puzzle pieces, rock layers matching across the ocean, fossils on opposite land masses and climatic evidence.
What is Continental Drift Theory?
When continental crust begins to separate, the stretched crust forms this long, narrow depression.
What is a rift valley?
The device that can detect small changes in magnetic fields used to study the ocean floor.
What is a Magnetometer?
A dark-gray to black fine-grained igneous rock that lines the ocean floor.
What is basalt?
What is the Lower Mantle?
When two plates slide horizontally past each other.
What is transform fault boundaries?
The theory that explains how new ocean crust is formed at ocean ridges and destroyed at deep-sea trenches.
What is seafloor spreading?
As the older portion of the seafloor sinks, the weight of the uplifted ridge is thought to push the oceanic plate toward the trench formed at the subduction zone.
What is Ridge Push?
The study of the history of Earth's magnetic fields.
What is Paleomagnetism?
The most well known transform fault boundary's name and where is it located?
What is the San Andres fault in California?
Liquid, where the magnetic field originates.
What is the Outer Core?
The 2 kinds of crustal plates.
What is continental and oceanic?
The scientist that explained that the rock at the mid-ocean ridges is younger than that near the continental shelf. He explained the mechanism that confirmed Continental Drift.
Who is Henry Hess?
The weight of the subducting plate pulls the trailing slab into the subduction zone much like a tablecloth slipping off a table can pull articles off it.
What is Slab Pull?
The imaginary line on a map that shows points that have the same age, they formed at the same time.
What is Isochron?
The rock that most continental crust is made of that is less dense, lighter-colored minerals like felspar and quartz.
What is Granite?
Solid Nickel and iron at the center of the Earth.
What is the Inner Core?
This happens when the flow in the outer core changes and Earth’s magnetic field changes.
What is magnetic reversal?
The huge pieces of crust and rigid upper mantle that fit together at their edges to cover Earth’s surface and move.
What is Plate Tectonics?
What is a volcanic island arc?
The transfer of thermal energy by the movement of heated material from one place to another. Circular movement.
What is convection currents?
The kind of image that appears on both sides of the Mid-Ocean ridges from the magnetic changes.
What is a mirror image?