Fossils
Fossils are found most often in which type of rock?
Sedimentary
A cold period when glaciers covered the Earth.
What is the Ice Age?
How old is the Earth?
4.6 billion years
Geologic time scale shows Earth's _____________
history
The young rocks are on top of the older rocks unless there has been a disturbance.
What is the Law Of Superposition?
The remains of an organism that were common and widespread but existed for only about 1 million years or less.
Index fossils
Approximately how old is earth?
4.6 billion years.
True or False: To determine the absolute date of an object you must compare one layer to another layer.
False
The natural chemical or physical processes that breaks down rock on Earth's surface.
weathering
What role did ice ages play during the Cenozoic Era?
Formed geological features visible today.
What type of organism parts are more likely to become a fossil?
Hard parts - like bone, teeth
Largest division of geologic time.
What is Eon?
An enormous mass of ice, moving over land.
What is a Glacier?
What is the smallest division of geologic time?
Epoch
How many mass extinctions has the Earth experienced?
5
Which Era is called "middle life" and included dinosaurs?
Mesozoic
Which Era is known as early life?
Paleozoic Era
This part of the Earth system includes mantle, crust, and core.
What is Geosphere?
The current geologic era we live in is called this.
Cenozoic Era
The extinction of many species in a short period of time.
What is mass extinction?
Which era are we currently living in?
Cenozoic
How do you determine the relative age of a rock layer?
by looking at the position of the layer and comparing it to other layers, youngest layer is on top and oldest layer is on the bottom unless there is a disturbance.
The longest Era was ____________.
What is the Precambrian?
Some rocks were made smooth by wind blowing smaller rock particles across their surface.
What is abrasion?
What event likely caused the extinction of dinosaurs?
Meteor Strike