Layers of Earth
The thin, outermost layer of the Earth.
What is the crust?
The scientist who proposed the theory that the continents are drifting.
Who is Alfred Wegener?
Convection currents that move the tectonic plates happen in this layer.
What is the mantle?
Type of boundary where the plates are moving away from each other.
What is a divergent boundary?
Vibrations created from earthquakes.
What are seismic waves?
The thickest layer, made out of hot rock that flows slowly.
What is the mantle?
The name of the supercontinent that existed 250 million years ago.
What is Pangaea?
The main source of heat that powers convection currents.
What is the Earth's core?
Seafloor spreading creates this at mid-ocean ridges.
What is new crust/new ocean floor?
This wave travels through solids and liquids.
What is a P-Wave?
The solid, dense center of the Earth.
What is the inner core?
Fossils match across continents, continents fit together like puzzles, and continents move 2.5 cm apart every year.
What is evidence of Continental Drift?
Convection currents cause this.
What is the moving of tectonic plates?
Mountains, deep ocean trenches, and volcanic activity occur here.
What are convergent boundaries?
Underwater mountain chain formed by divergent boundaries.
What are mid-ocean ridges?
The liquid layer made out of molten iron and nickel.
What is the outer core?
The reason Wegener's theory was not accepted at first.
What is "He couldn't explain how the continents moved"?
Changes in this due to temperature changes that cause material to rise or sink.
What is density?
The type of geologic event found typically at a transform boundary.
What is an earthquake?
San Andreas fault where the plates slide past each other is an example of this boundary.
What is a transform boundary?
This layer is broken into tectonic plates and includes part of the crust and upper mantle.
What is the lithosphere?
The process discovered by Harry Hess when he mapped the ocean floor.
What is seafloor spread?
The three processes or forces that set convection currents in motion.
What are heating and cooling (temperature), changes in density, and gravity?
The name of the process where a denser plate sinks beneath a less dense one at a convergent boundary.
What is subduction?
Where Alfred Wegener met his icy death.
What is Greenland?