Review from the Past
A remain from animal activity in the past is called a _____ _______.
trace fossil
The study of the earth is known as __________.
geology
The first eon is called ____________.
the Hadean Eon
The first era of the Phanerozoic Eon was the ______________.
Paleozoic era
___________ _____________ involves comparing fossils or events to one another to determine the age of something.
relative dating
Similar to a number line, the ______________ organizes earth's history into sections based off of fossil discovery.
Name the 3 eons that make up Precambrian Time.
Hadean, Archean, and Proterozoic
Today, we live in the _____________ era.
A missing layer of rock in the geologic column is called an ______________.
unconformity
The largest unit of time is known as the _______.
eon
The term for the continents being connected as one supercontinent is called ___________.
pangea
Dinosaurs roamed the earth during the _____________ era.
Mesozoic
The law of ___________ states that newer layers of rock lie on top of older layers of rock.
superposition
The Phanerozoic Eon is broken down into 3 main ______.
eras
During the Proterozoic, the ____________ formed from bacteria releasing oxygen into the air.
atmosphere
Name the 3 periods in the Mesozoic Era.
Triassic, Jurassic, Cretaceous
Determining the actual age of an object or event is called _________ __________.
absolute dating
The belief that all geologic changes occur due to sudden large events is called ____________.
catastrophism
How is the geologic time scale distorted due to its representation of Precambrian Time?
Name the two period of the Cenozoic Era.
Tertiary and Quaternary