Transcript Check Your Answer 200 Answer

Fossils
Age of
Rocks
Radioactive
Decay
Geologic
Time Scale
Hodge
Podge
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50
Question:
The preserved remains or traces
of an organism is called a:
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Answer: fossil
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100
Question:
A fossil that formed when
minerals replace all or part of
an organism is called a:
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Answer:
Petrified fossil
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200
Question:
Which type of fossil can
provide clues about the
activities of ancient
organisms?
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Answer:
Trace fossils
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300
Question:
The fossils of organisms that
were widely distributed but only
lived during a short period of
time are called:
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Answer:
Index fossils
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500
Question:
Which part of organism generally
becomes a fossil, the soft or hard
part?
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Answer:
Hard
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50
Question:
The age of rock compared the
age of other rocks is called:
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Answer:
Relative age
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100
Question: In horizontal layers
of sedimentary rock, each
layer is older than the layer
above and younger than the
layer below it. This is called:
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Answer:
The Law of Superposition
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200
Question: What is the age of
an intrusion of igneous rock in
relation to the sedimentary rock
layers through which it passes?
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Answer:
Always younger
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300
Question:
Is a fault younger or older
than the rock it cuts across?
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Answer:
Younger
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500
Question:
Why is Potassium-40 useful for
dating very old rocks?
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Answer:
Because is has a long half-life of 1.3
billion years.
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50
Question:
Radioactive decay occurs
when atoms of an unstable
element do what?
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Answer:
break down to form atoms of
another element
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100
Question:
The time it takes for half of the
radioactive atoms in a sample of a
radioactive element to decay is the
element’s:
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Answer:
Half-life
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200
Question:
Radioactive dating enables
geologists to know what?
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Answer:
the absolute ages of rocks.
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300
Question:
Radioactive dating works best
with what type of rocks?
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Answer:
Igneous Rocks
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500
Question:
How do Relative dating and
Absolute dating differ?
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Answer:
Relative dating compares different rocks
to one another to see which is younger or
older.
Absolute dating finds the actual age of
the rock.
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50
Question:
The Mesozoic Era is divided into the
Triassic, the Jurassic, and the
Cretaceous. These divisions of the
geologic time scale are called what?
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Answer:
Periods
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100
Question:
Jawless fish were Earth’s first
what?
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Answer: Vertebrates – animal
with a backbone
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200
Question: At the beginning of
the Paleozoic Era, a great
number of different types of
organisms evolved (appeared)
in an event called the:
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Answer:
Cambrian Explosion
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300
Question:
Paleozoic, Mesozoic, and
Cenozoic are divisions in the
geologic time scale called:
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Answer:
Eras
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500
Question:
What do most scientists think
caused the mass extinction of
dinosaurs and other organisms at
the end of the Cretaceous Period?
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Answer: An object from space
struck Earth.
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50
Question:
Earth’s atmosphere, oceans, and
continents began to form during the first
several hundred million years of what
time period?
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Answer:
Precambrian Time
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100
Question:
How did the Earth change about 2.5
billion years when many organisms
began using photosynthesis to make
food?
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Answer:
The amount of oxygen in the atmosphere
increased.
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200
Question:
A type of organism that no longer
exists on Earth is said to be:
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Answer:
extinct
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300
Question:
The process by which all the
different kinds of living things have
changed over long periods of time is
called:
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Answer:
Evolution
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500
Question:
In which type of fossil might you find
the remains of an insect preserved
with little or no change?
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Answer:
Amber
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