Volcanoes
Geologist measure volcanic eruptions with this scale
What is the Volcanic Explosivity Index?(VEI)
When one plate slips under another
What is a subduction zone?
Found at the boundary between tectonic plates,a fracture in earths crust
What are faults?
An opening in earths surface that allows ash,lava and gases escape
What is a volcano?
Plates slide past each other,resulting in earthquakes
Earthquakes are measured by its
What is momentum and magnitude?
In this case a magma chamber can be tens of miles large in diameter
What is a Supervolcano?
He developed the theory of continental drift
Who is Alfred Wegener?
The point inside earth where an earthquake starts
What is the focus?
Layer of earth that contains magma chambers
What is the mantle?
Plates push together to create mountains
What are convergent boundaries?
Causes rocks to move up and down and side to side
What are surface waves?
When volcano's reach above sea level a ____ is formed
What is an island?
New land is formed when magma rises to the surface filling in the gaps of the two plates
What is seafloor spreading?
or
What are divergent boundaries?
Total force acting on crustal rocks per unit of area
What is stress?