Age Dating
the principle that in undisturbed rock layers, the oldest rocks are on the bottom
What is superposition?
A subdivision of a period
What is an epoch?
slowest type of movement, by gravity, soil, rock material, entire slope moves, very widespread, imperceptible, occurs over years.
What is creep?
This volcano erupted in May, 1980. The next month, it erupted again, and ash fell on Portland
What is Mt St Helens?
Earthquakes are caused when too much of this has built up in rocks and they can no longer handle it.
what is pressure/stress?
A surface where rock has eroded away, producing a break or gap, in the rock record
What is an unconformity?
A subdivision of an eon
What is an era?
material on a slope becomes saturated with water from heavy rain &/or snow melt and it is liquefied
What is a flow?
This volcano has lava that flows over highways in Hawaii.
What is Kilauea?
A wall of water created when an earthquake occurs in the ocean floor
What is a Tsunami?
The time required for half of the parent isotope to decay into daughter isotopes
What is a half-life?
The longest unit of geologic time
What is an eon?
landslide caused by rock failure in which part of the bedding plane of failure passes through compacted rock and material collapses en masse and not in individual blocks
What is a Rock Slide?
This volcano in Italy erupted in the year 79AD. You can still see the homes and statues of the people of Pompeii.
What is Mt. Vesuvius?
When a rock return to its original shape after an elastic deformation
What is elastic rebound?
matching rocks and fossils from separate locations
What is correlation?
A subdivision of an era
What is a period?
material rotates along a shear plane as a cohesive unit. Leaves a scarp or series of scarps, retrogressive
What is a Slump?
ParicutÃn is in this country
What is Mexico?
San Andrea's fault is the result of this boundary.
What is Transform Boundary?
The numerical age, in years, of a rock or object
What is absolute age?
The extinction of many species on Earth within a short period of time
What is a mass extinction?
maximum slope angle that any given unconsolidated material can attain.
What is angle of repose?
This Oregon volcano collapsed and formed a caldera called Crater Lake.
What is Mt. Mazama?
The tremors that follow major earthquakes as the Earth readjusts.
What are aftershocks?