Continental Drift
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