Unit II Flashcards
It is the outermost layer of Earth.
Crust
Involves the breaking down of rocks and minerals found on the surface of the earth.
Weathering
Soil, rock, and other surface materials are worn away and transported by natural forces.
Erosion
The ductile part of Earth that is approx. 100 km to 700 km. deep from the crust.
Asthenosphere
Boundary between the lower crust and the upper mantle.
Mohorovicic Discontinuity
Underneath the crust.
Mantle
Boundary between the lower mantle and the outer core.
Guttenberg Discontinuity
Central part of Earth that has two layers.
Core
What are the two layers of the Core?
Outer Core and Inner Core
Only liquid layer of Earth.
Outer Core
Who discovered the inner layer?
Inge Lehmann
Boundary between the outer core and the inner core.
Lehmann Discontinuity
Described as any sudden shaking of the ground that often occurs along geologic faults.
Earthquake
Where the earthquake begins.
Focus or Hypocenter
Point directly above the focus.
Epicenter
Fracture found between two blocks of rock on Earth’s crust.
Fault
What are the 3 types of Fault?
Normal, Reverse, Strike-Slip
The hanging wall moves down.
Normal Fault
Hanging wall moves up.
Reverse Fault
Motion of the blocks is horizontal or sideways,
Strike-slip
Those that move one or more times in the last 10 000 years.
Active faults
Those that did not move or have been inactive for millions of years.
Inactive faults
Estimate of the relative size or strength of an earthquake.
Magnitude
Developed by Charles Richter that was used to measure the magnitude of an earthquake.
Richter Scale
Describes the severity of an earthquake.
Intensity
What is PEIS?
PHIVOLCS Earthquake Intensity Scale
What is PHIVOLCS?
Philippine Institute of Volcanology and Seismology
Travels through the surface of Earth.
Surface Waves
Penetrate through the layers of earth.
Body Waves
Two types of body waves.
P-waves and S-waves