Plate Boundaries
These boundaries collide or smash together.
What are convergent boundaries?
This thin, outermost layer provides a solid surface for land and oceans.
What is the crust?
Heat transfer through touch is called this.
What is conduction?
Fossils provide evidence for this concept about the Earth's surface.
What is plate tectonics?
Mountains and trenches can form at these boundaries.
What are convergent boundaries?
These boundaries move apart, creating mid-ocean ridges.
What are divergent boundaries?
This thick middle layer transfers heat and drives tectonic plate movement.
What is the mantle?
Heat transfer by the movement of liquids and gases is called this.
What is convection?
These waves provide evidence that Earth has a solid core.
What are seismic waves?
Rift valleys and mid-ocean ridges form at these boundaries.
What are divergent boundaries?
These boundaries slip and slide past each other, often causing earthquakes.
What are transform boundaries?
This molten layer is made mostly of iron and 10% sulfur
What is the outer core?
Heat transfer through empty space is called this.
What is radiation?
Alfred Wegener proposed that continents were once joined in a single landmass.
What is the theory of continental drift?
Earthquakes are common along this type of boundary.
What are transform boundaries?
Mount St. Helens is an example of this type of boundary
What is a convergent boundary?
This dense, solid layer is composed of iron at the center of the Earth.
What is the inner core?
This occurs inside Earth when molten rock rises as it is heated and then cools near the surface.
What is a convection current?
Harry Hess proposed that the ocean floor is continually spreading and adding new material.
What is sea-floor spreading?
This molten material supports the theory of sea-floor spreading.
What is magma or molten rock?
The Great Rift Valley is found at this type of boundary
What is a divergent boundary?
his process occurs when older, denser material sinks below younger material at plate boundaries
What is subduction?
The movement of molten rock in the mantle is an example of this type of heat transfer.
What is convection?
The slow movement of continents due to convection currents supports this theory.
What is the theory of continental drift?
The edges where Earth’s plates meet are called these.
What are plate boundaries?