Lesson Four
Because the time span of Earth's past is so great, geologist use the ________ time scale to show Earth's history.
geologic
Scientist believe that ________ and the moon are about the same age.
Earth
A(n) ______________ occurs when many types of living things die out at the same time.
Scientist divided the time between Precambrian Time and the present into _______ units of time, or eras.
three
Which university, known for its storied basketball tradition in the SEC, goes by the mascot “Wildcats”?
Kentucky
Scientist chose where units of geologic time began and ended based on major changes in ______________ at certain times.
life forms
According to scientists, Earth began as a ball of dust, rock, and _________ in space.
ice
The Mesozoic Era is often called the Age of ________ because of the success of these animals.
Reptiles
__________ for many of the geologic periods come from the places around the world where geologist first described the rocks and fossils of that period.
Names
What is the lowest seed that has ever won the NCAA Tournament?
8
The long span of time that begins geologic time is called _______________.
Precambrian Time
_______ pulled this mass together.
Gravity
The Triassic Period saw the rise of __________, or warm-blooded vertebrates that feed milk to their young.
mammals
The earliest form of life known on Earth was ________________.
single-celled organisms
Which team was famously known as the 'Fab Five' in the early 1990s?
Michigan Wolverines
Geologists divided the time between Precambrian Time and the present into three long units of time called ________________.
eras
A(n) __________ is a ball of dust, gas, and ice that orbits the sun.
comet
The geologic period in which we are living is called the ___________.
Quaternary Period
Scientist believe that Earth's core and crust formed after the materials pulled by Earth's gravity became very hot and ___________.
melted
Which team holds the record for the most NCAA tournament championships?
UCLA
The Triassic Period, the Jurassic Period, and the Cretaceous Period occurred in the ________ Era.
Mesozoic
According to scientists, over billions of years, Earth's _________ have formed, broken apart, and crashed together again.
landmasses
A(n) __________ is an animal without a backbone.
invertebrate
Near the end of _______________ single-celled organisms were joined by more complex living things.
Precambrian Time
How many teams currently participate in the main bracket of the NCAA Tournament?
68