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Final Exam Review

LMS Ch 12, 13 Review

QuestionAnswer
When molten rock erupts onto the Earth's surface it is known as?? Lava.
How do scientists identify the location of Plate boundaries?? Ocean boundaries.
Which of the following is a type of Seismic Wave?? Body Waves.
Mafic rock commonly makes up?? Oceanic Crust.
Felsic rock commonly makes up?? Continental Crust.
Mafic magmas, with low viscosity and runny lava, cause?? Quiet eruptions.
Felsic magmas, with high viscosity and sticky lava, cause?? Explosive eruptions.
What are the fastest body waves?? P waves.
Earthquakes generally occur at plate boundaries, where?? Stress on rocks is greatest.
On the modified Mercalli scale, how is intensity XII described?? Causes total destruction.
The eruption of Mount St.Helens was?? An Explosive Eruption.
Magma or igneous rock that is rich in magnesium and iron and that is generally dark in color is called?? Mafic.
When lava cools rapidly, a crust forms on the surface of the flow. If the flow continues, the crust wrinkles and forms volcanic rock known as?? Pahoehoe.
Magma or igneous rock that is rich in felspar and silica and is generally light in color is called?? Fesic.
What causes tunamis?? Undersea earthquakes, landslides, volcanic eruptions.
This area is both a major earthquake zone and volcano zone?? Pacific Ring of Fire.
Volcanic eruptions may be signaled by?? A change in earthquake activity.
A geologic fault in which the hanging wall has moved downward where two blocks of rocks are pulled apart?? Normal Faults.
A fault in which one block slides horizontally past one another?? Strike-Slip Faults.
The sudden return of energy or elasticity of an deformed rock back to normal state?? Elastic Rebound.
The point on the Earth's surface directly above an earthquake's starting point?? Focus.
Used to express the intensity of the Earthquake based on descriptions?? Mercalli Scale.
The location within the Earth along a fault at which the first motion of an earthquake occurs?? Epicenter.
S wave?? A seismic wave that can only travel through solids.
Surface Wave?? A seismic wave that travels along the surface of a medium.
Body Wave?? A seismic wave that travels through the body of a medium.
P wave?? A seismic wave that can travel through solids, liquids, and gases.
Created by: ericyonggyuhong