____ are the longest units of geologic time.
Eons
Which period was 542-488 million years ago?
The Cambrian Period
The youngest era is the ________ ___.
Cenozoic era
What does 100 + 100 - 100 + 100 - 100 equal?
Your free 100 points!
What does Dinosaur mean?
Giant lizard.
Eons are subdivided into smaller units of time called ____.
Eras
The Ordovician Period
The ________ ___ is the middle era of the Phanerozoic eon.
Mesozoic era
Probably the most known is the _____ _________ that impacted upon earth killing millions of organisms.
Giant Meteorite
What is Pangea?
The giant supercontinent that dinosaurs lived on.
Eras are subdivided into _______.
Peroids
Which period was 444-416 million million years ago?
The Silurian Period
The oldest era is the _________ ___.
Paleozoic era
A almost accurate idea is that earth heat up so much that it started multiple ______ _________ and they soon covered the earth burning most things out.
Global Wildfires
What does 100 + 100 + 100 - 300 + 300 - 300 + 300 equal?
Your free 300 points!
Periods are subdivided into ______.
Epochs
Which period was 416-359 million years ago?
The Devonian Period
A ____ _____ is an oxygen-poor environment where, over time, plant material changes into coal.
Coal Swamp
Probably the strangest mass Extinction is the ______ ________.
Global Sickness
Which period was 299-251 million years ago?
The Permian Period
What does 500 - 500 - 500 equal?
Your loss of 500 points
Which period was 359-299 million years ago?
The Carboniferous Period
What do the Paleozoic, the Mesozoic and the Cenozoic eras make up together.
The Phanerozoic eon.
The _____ _____ is the most solid idea for what killed out most organisms during the time between the dinosaurs and the ice age.
Great Flood
What is the most know period?
The Jurassic Period