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KMS8Sci CH 15

The Rock and Fossil Record

The same geologic processes have been at work throughout Earth's history. The principle of uniformitarianism
THe principle that states that geologice change is sudden Catastrophism
The study of past life using fossils. Paleontology
Sciencetist who study past life using fossils. Paleontologists
Remains of organisms preserved by geologic processes Fossils
The study of the history of the Earth Geology
Most fossils are preserved in Sedimentary Rock
A missing layer of rock in a sequencing parallel rock layer Disconformity
The idea that younger rocks lie on top of older rocks. Superposition
A break in the geologic record. Uncomformity
The process of figuring out if an object is older or younger than another. Relative Dating
The process of wearing down. Erosion
A missing layer that exitsts between horizontal and folded rock layers. Angular Unconformity
A break in the Earth's crust. Fault
Process in which minerals replace tissues. Mineral Replacement
Unstable isotopes Radioactive
The process of figuring out how old an object is Absolute dating
The most common method of absolute dating Radiometric Dating
The time it takes for one-half of a radioactive sample to decay Half-life
The process in which radioactive isotopes break down into stable isotopes Radioactive Decay
Mark or Cavity Mold
Fossil from a specific time period Index Fossil
Fossil formed by an animal's movement Trace Fossil
mold filled with sediment Cast
What is hardened tree sap? Amber
Largest division of geologic time. Eon
Unit of geologic time that includes two or more periods Era
Third largest division of geologic time Period
Fourth largest division of geologic time Epoch
Death of a species Extinction
Standard method that divides Earth's history into parts Geologic Time Scale
A mark left by a dinosaur's tail would be considered a Trace Fossil
How many years of Earth's history do geologists study? 4.6 Billion Years
To reconstruct Earth's climate history, Scientists drill out? Ice Cores
Created by: stameykl