Earth's History Question Preview (ID: 42103)
Chapter 11 Review.
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If all Earth’s history took place in one year starting on January 1, humans would have appeared in _______________
a) June
b) July
c) October
d) December
Earth formed layers because _____ pulled more dense material to the center.
a) Magnetism
b) Gravity
c) Plate Tectonics
d) Weather
Geologic time is divided into units based upon types of _____.
a) sedimentary rocks
b) climatic changes
c) organisms
d) igneous rocks
The longest subdivision in geologic time is a(n) _____.
a) epoch
b) century
c) period
d) eon
Little is known about much of Earth’s early history because _____.
a) Precambrian rocks have been deeply buried
b) Precambrian rocks have been changed by heat and pressure
c) Precambrian soft-bodied life-forms weren’t often preserved as fossils
d) all of the above
The division of Earth’s history into smaller units makes up the _____.
a) eras
b) periods
c) geologic time scale
d) sequence of events
Geologists organized the geologic time scale based on _____.
a) superposition
b) evenly spaced time segments
c) fossils in the rock layers
d) both Superposition and Fossils in rock layers
A life-form in the Precambrian time was _____.
a) cyanobacteria
b) dinosaurs
c) humans
d) reptiles
After the Sun formed, gravity _____.
a) pushed particles away from the center of the Sun.
b) pulled pieces of material together to form planets, including Earth.
c) neither a nor b
d) both a and b
During the great Proterozoic eon, the percentage of oxygen in the atmosphere changed _____.
a) from 3% to 20%
b) from 20% to 3%
c) from 3% to 5%
d) from 10% to 100%
Two supercontinents, _____ and _____, had warm shallow oceans near the shores.
a) Pangea, Spriggina
b) Pangea, Asia
c) Asia, Rodinia
d) Pangea, Rodinia
Toward the end of the Proterozoic eon, which of the following formed?
a) the final multicellular organisms
b) the final single-cellular organisms
c) the first single-cellular organisms
d) the first multicellular organisms
Why do scientists hypothesize that an asteroid impact led to a mass extinction event?
a) An asteroid impact would have changed Earth’s climate so rapidly that organisms didn’t have a chance to adapt.
b) A large asteroid would have landed on so many organisms that it killed all the members of many species.
c) An asteroid would have introduced poisonous gasses into Earth’s atmosphere.
d) All of the above are true statements.
Major changes in the environment _____.
a) can cause new organisms to flourish
b) can cause many existing organisms to go extinct
c) can result in existing organisms to adapt quickly
d) all of the above
How would an asteroid impacting Earth effect the climate?
a) The dust and rocks thrown into the atmosphere slowly cause global cooling.
b) The dust and rocks thrown into the atmosphere rapidly cause global cooling.
c) The dust and rocks thrown into the atmosphere slowly cause global warming.
d) The dust and rocks thrown into the atmosphere rapidly cause global warming.
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