earthquake/volcano Flashcards
ring of fire
a principle that states that geologic processes that occurred in the past can be explained by current geologic processes
Strike-slip fault
a principle that states that geologic change occurs suddenly
Normal fault
the scientific study of fossils
Reverse fault
any method of determining whether an event or object is older or younger than other events or objects
P-waves
any method of measuring the age of an event or object in years
S-waves
a principle that states that younger rock slide above older rocks if the layers have not been Disturbed
epicenter
an atom that has the same number of protons as other atoms of the same element do but that has different number of neutrons
focus
the process in which a radioactive isotope tends to break down into a stable isotope of the same element or another element
Richter magnitude scale
the time needed for half of a sample of a radioactive substance to undergo radioactive decay
explosive volcano
The Remains or physical evidence of an organism preserved by geological processes
nonexplosive volcano
a fossilized Mark that is formed in soft sediment by the movement of an animal
Krakatoa
a Mark or cavity made in a sedimentary for Surface by a shell or other body
. Yellowstone supervolcano
a type of fossil that forms when sediments fill in the cavity left by a decomposed organism
San Andreas fault
a break in the geologic record created when rock layers are eroded or when sediment is not deposited for a long period of time
Mid-oceanic ridge
when the number of species decreases dramatically over a relatively short period Of time
