The theory of Continental Drift was first proposed by.
Alfred Wegener
100
Most earthquakes are caused by __________.
plate movement
100
Most volcanoes form due to _________, where one plate is forced under another.
Subduction
100
Minerals which break along smooth, flat surfaces have the property known as ________.
cleavage
200
What is not a branch of earth science?
Astronomy
200
According to the theory of Continental Drift, all the earth’s continents were once joined in a “Super continent” known as.
Pangaea
200
Waves produced by earthquakes are known as _________ waves.
seismic
200
Ocassionally, volcanoes such as Kilauea form from ________ in the middle of plates.
hot spots (magma plume)
200
Minerals have all the following characteristics except ________.
they are organic
300
A ____________ is a conclusion which has been drawn using substantial proof.
Law
300
This “Supercontinent” is believed to have started separating about __________ years ago
200 million
300
A minimum of ________ seismograh stations are required to pinpoint the location of an earthquake's epicenter.
three
300
A “ropy” type of mafic lava which cools slowly is known as ______.
pahoehoe
300
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.
anthracite, bituminous
400
A ____________ is a conclusion which has been drawn using observation and repeated testing, but lacks substantial proof
Theory
400
what is not a form of evidence supporting continental drift?
Written Accounts from Ancient Civilizations
400
The point on the Earth's surface directly above where the earthquake occured is known as the _________.
epicenter
400
A substance's ability to resist flow is known as its ________.
viscosity
400
what is not a cause of erosion in Pennsylvania today?
Glaciers
500
The cooridinates of the point where the Equator crosses the International Date Line are
0 degrees S, 180 degrees W
500
Continental Crust is _________ and __________ then oceanic crust.
thicker, less dense
500
The ________ scale demonstrates the intensity or damage caused by an earthquake.
richter
500
Jagged mafic lava which has cooled quickly is known as ______.
aa
500
_____________ is a technology where pressurized water and chemicals are used to fracture shale, in order to obtain natural gas.