Plate Boundaries
Name the 3 types of plate boundaries and describe how the plates are moving
Divergent = 2 plates dividing from each other
Convergent = 2 plates colliding with each other
Transform = 2 plates sliding past each other
Two plates sliding past each other creates what geohazard?
Earthquake
How many major plates exist?
12
What are earthquakes?
Vibrations of earths crust
Thick less dense crust
Continental
Name the two types of crust that make up tectonic plates.
Oceanic and continental
When two continental plates collide what is formed?
Mountains
Pangea or "Super-continent" states what?
All the continents on earth were hooked together
The richter scale measures?
The amount of energy released (Magnitude)
Locates and measures an earthquake
Seismograph
The cycle of hot material rising; cool material sinking
Convection Currents
Divergent boundaries on land result in a(n)?
Rift valley
Describe the 5 pieces of evidence that supports Wegener's theory?
Continents fit like a puzzle piece.
Fossils of the same species found on two continents that are now separated.
Mountain ranges of the same rock type found on opposite sides of the Atlantic
Grooves left by glaciers found on different continents.
Seafloor spreading
What causes faults?
Stress between rocks
Zone in earth's mantle made of a hot fluid
Asthenosphere
Refers to the region where one plate moves under another plate.
Subduction zone
Mid-Atlantic Ridge is created by what two crust dividing?
Two oceanic plates
Define the continental drift theory?
The theory that continents have drifted (moved) over time.
Name the 3 types of scales used to measure earthquakes?
Richter, Mercalli, and Rossi-Forel
This can continue to cause damage even after the earthquake is over.
Aftershock
Define Lithosphere
Rocky outer layer of earth including the crust and upper mantle.
When 1 oceanic plate collides with another what is formed?
A trench or volcanic island arcs in the ocean
Define tectonic plates
Pieces of the lithosphere that move and interact with each other.
Place in order the 3 types of waves created by an earthquake
Primary (P) waves, Secondary (S) waves, Surface (L) waves.
Of the 1900 active volcanoes in the world, 90% occur in what area of the world?
Ring of fire