What is the supercontinent when all Earth land was connected 200 million years ago?
100
Ring of Fire
What is the nickname of the region bordering the Pacific Ocean where 80% of all earthquakes occur on Earth?
100
Shield
What type of volcano very wide or broad, very runny lava, non-explosive due to low gas content?
100
compaction
What is the pressing and squeezing out of water and air between sediments?
200
Richter
What is the scale that measures energy or magnitude of the earthquake?
200
Alfred Wegener
Who was a meteorologist who developed theory of continental drift?
200
Elastic Rebound Theory
What theory describes, plates try to move past each other, they begin to bend as stress builds up. Eventually, the plates move past and the plates rebound back into shape causing an earthquake?
200
Cinder Cone
What type of volcano is short and steep, cinders (medium-viscosity) lava, medium explosiveness?
200
Mafic
This composition is dark in color.
300
Mid-Ocean Ridges
What is the feature which forms at the center of seafloor spreading regions are known as?
300
Divergent Boundries
What are plates that are moving away from one another?
300
Cause of Earthquakes
What is when at transform and convergent (subduction) boundaries, plates moving past each other cause stress to build up and then release energy causing earthquakes?
300
Composite
What type of volcano is very tall and mountainous, Lava is mostly pyroclasts, highest gas content, very explosive?
300
Felsic
This composition is light in color.
400
Modified Mercalli
What is the scale that measures the intensity or damage caused by an earthquake?
400
Mid-Ocean Ridges
What is the underwater mountain chain formed as new magma rises to the surface. At the center of the ridge, seafloor spreading occurs?
400
Interplate Earthquakes
What are earthquakes that occur in the middle of plates and not at plate boundaries? Occur rarely and are not as powerful.
400
Composite
What type of volcano is Mt. St. Helens
400
Intrusive
What are rocks that form underground?
500
thinner, darker
Mafic lava is _____ and _____ than felsic lava.
500
Panthalassa
What is the Superocean surrounding Pangaea 200 million years ago?
500
Epicenter
What is the point on the surface of the Earth directly above the focus of the earthquake?