What is the name of the former supercontinent?
Pangaea
What is the theory of plate tectonics?
The idea that Earth's plates are constantly in motion.
How do earthquakes occur?
As a result of movement along breaks in Earth’s lithosphere (faults)
List the 3 types of volcanoes from least to most explosive.
Shield volcanoes, cinder cone volcanoes, composite volcanoes
Give an example of a composite volcano.
Mt. Mazama, Mt. St. Helens, Mt. Shasta, Mt. Fuji, Mt. Rainier, etc.
Who proposed the theory of continental drift?
Alfred Wegener
What are the 3 types of plate boundaries?
Divergent, convergent, transform
What are the 3 main types of faults?
Normal (divergent boundaries), reverse (convergent boundaries), strike-slip (transform boundaries)
What are the 3 types of places that volcanoes form?
Divergent boundaries, convergent boundaries, hot spots
As viscosity decreases, explosivity ____.
What phenomenon is responsible for the movement of our continents (and ultimately the movement of our plates)?
Convection currents
continental - continental, ocean - oceanic, continental - oceanic
What is the difference between an earthquake's focus and its epicenter?
Focus = spot underground from which earthquake originates
Epicenter = spot above the focus on Earth's surface
Define viscosity.
Resistance to flow
Who is the new head coach of UO's football team?
Dan Lanning
Present 2 pieces of information supporting Pangaea.
Fossils, marks from glaciers, plants. mountain ranges, rocks, etc.
What property is responsible for determining which plate subducts at a convergent boundary?
density
In what order do the 3 main types of seismic waves arrive?
P-waves, S-waves, surface waves
As silica levels increase, explosivity ______.
Increases
What are the two types of lava flows?
Present 2 pieces of information that support seafloor spreading.
Occurs at plate boundaries, age of rocks increases away from mid-ocean ridges, sediment thickness increases away from mid-ocean ridges, reversing magnetic polarity
What type of boundary is found at mid-ocean ridges/is responsible for seafloor spreading?
Divergent boundaries
How do scientists measure earthquake intensity?
Modified Mercalli Scale
What are two after effects of volcanic eruptions?
Ash fall, lava flows, mudslide, pyroclastic flow
S-waves