Earth's StoryQuestion: the idea that geologic processes occurring now are the same as those in the past
Question: the idea that geologic change happens suddenly
Question: the study of past life using fossils
Question: a scientist who outlined uniformitarianism in 1788
Answer: James Hutton
Question: a scientist who published "Principles of Geology" from 1830-1833
Answer: Charles Lyell
Relative DatingQuestion: the idea that younger rocks lie on top of older rocks
Question: the process of figuring out if an object is older or younger than another
Answer: relative dating
Question: a break in the geologic record
Question: the process of wearing down
Question: a missing layer of rock
Absolute DatingQuestion: the process of figuring out how old (in years) an object is
Answer: absolute dating
Question: the most common method of absolute dating
Answer: radiometric dating
Question: method that dates rocks older than 100,000 years old
Answer: potassium-argon method
Question: the time it takes for one-half of a radioactive sample to decay
Question: unstable isotopes
Mixed BagQuestion: According to uniformitarianism, geologic change happens _____________.
Question: What is an example of a catastrophe?
Answer: EQ, volcano, asteroid hitting Earth
Question: How are rock layers arranged in the geologic column?
Answer: oldest rocks are on the bottom
Question: Define fault.
Answer: a break in Earth's crust
Question: What is the most common type of unconformity?
Misc.Question: Define isotope.
Answer: atoms with the same number of protons but different number of neutrons
Question: Name one method of radiometric dating used for rocks more than 10 million years old.
Question: What does a scientist need to know to figure out the absolute age of a rock?
Answer: the rate of decay for a radioactive element in the rock
Question: Name 2 index fossils
Question: Name the 4 criteria needed for all index fossils
Answer: uniquewidespreadlived a short period of timeabundant