The bending of rocks and snapping back into place when stress is released is known as the _________.
What is Elastic Rebound Theory
100
The theory of Continental Drift was first proposed by ________________.
What is Alfred Wegener
100
The point on the Earth's surface directly above where the earthquake occured is known as the _________.
What is epicenter
100
Most volcanoes form due to _________, where one plate is forced under another.
What is subduction
100
____________ is a technology where pressurized water and chemicals are used to fracture shale, in order to obtain natural gas.
What is Fracking
200
Continental Crust is _________ and __________ then oceanic crust.
What is thicker, less dense
200
According to the theory of Continental Drift, all the earth’s continents were once joined in a “Supercontinent” known as ________________.
What is Pangaea
200
Waves produced by earthquakes are known as _________ waves
What is seismic
200
Ocassionally, volcanoes such as Kilauea form from ________ in the middle of plates.
What is hot spots (magma plume)
200
Most sinkholes in Pennsylvania form when pockets of __________ dissolve away.
What is limestone
300
Most earthquakes are caused by __________.
What is plate movement
300
This “Supercontinent” is believed to have started separating about __________ years ago
What is 200 million
300
A minimum of ________ seismograh stations are required to pinpoint the location of an earthquake's epicenter.
What is three
300
A “ropy” type of mafic lava which cools slowly is known as ______.
What is pahoehoe
300
What causes holes in some igneous rocks such as pumice?
What is dissolved gases
400
Which of the following is NOT a form of evidence supporting continental drift?
What is Written Accounts from Ancient Civilizations
400
Seafloor Spreading is _____________.
What is The formation of new seafloor and the movement of older seafloor outward
400
The ________ scale demonstrates the intensity or damage caused by an earthquake.
What is Modified Mercalli
400
A substance's ability to resist flow is known as its ________.
What is viscosity
400
The most common type of coal found in Pennsylvania is _________ coal, although the state produces more __________ coal than any other state in the United States.
What is bituminous, anthracite
500
Features which form at the center of seafloor spreading regions are known as ______________.
What is Mid-Ocean Ridges
500
Features which form at the center of seafloor spreading regions are known as ______________.
What is Mid-Ocean Ridges
500
The __________ scale measures the energy or magnitude of the earthquake.
What is Richter
500
Most of the world's volcanoes are found in a region known as ____________.
What is The Ring of Fire
500
Which of the following is not a cause of erosion in Pennsylvania today?