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Earth Science
Earth Science
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Earth processes, fossils, fossil dating, geologic time
Flashcards
25 cards
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Questions
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Answers
1
How is a mold fossil formed?
A small organism trapped in tree sap, hardening into amber.
A fossil impression left by a dead organism rotting away.
An organism trapped in tar, preserving only its bones.
A fossil impression filled in with minerals.
2
When was Earth formed?
4.6 bya
3.5 mya
4.6 mya
65 mya
3
How do most geologic eras begin?
Global warming
Mass extinctions
Ice age
New dominant species evolve
4
Which type of rock is most likely to contain fossils?
Igneous rock
Metamorphic rock
Magma
Sedimentary rock
5
Which fossil dating method determines exact age by measuring radioactive decay?
Absolute dating
Relative dating
Plate tectonics
Law of Superposition
6
What is a "half-life" of a trilobite?
The number of years a trilobite lived divided by two.
One-half of the time it takes for all the C-14 to decay.
The lifespan of a trilobite dying before adulthood.
The time it takes for half of its C-14 atoms to decay.
7
What are conditions for fossil formation?
Organism must be left out in the sun.
Organism must rot away.
Organism must die and be buried quickly.
Organism must not solidify.
8
Which type of rock is formed by heat and pressure ?
Magma
Igneous
Metamorphic
Sedimentary
9
What type(s) of information does relative dating provide ?
Evolution of organisms
Size and shape of past organisms
All are correct.
The type of environment
10
In which era was the "Age of Reptiles"?
Paleozoic
Pre Cambrian
Mesozoic
Cenozoic
11
In which era did the first cells evolve?
Mesozoic
Pre Cambrian
Paleozoic
Cenozoic
12
How do most geologic eras end?
Asteroid impact
Ice age
Global warming
Mass extinctions
13
What is the Law of Superposition ?
Fossils in top layers are younger than those on the bottom
Fossils in middle layers are younger than those at the top
Fossils in top layers are older than those on the bottom
Fossils in bottom layers are younger than those at the top.
14
In which era did birds, flowers, and mammals first evolve ?
Cenozoic
Pre Cambrian
Paleozoic
Mesozoic
15
Which era do we live in right now?
Paleozoic
Cenozoic
Pre Cambrian
Mesozoic
16
In which era was the Earth formed?
Mesozoic
Cenozoic
Paleozoic
Pre Cambrian
17
In which era did the moon and oceans form?
Pre Cambrian
Mesozoic
Paleozoic
Cenozoic
18
What is an example of catastrophic change?
Sediment depositing to form layers
An asteroid impact ending the dinosaur era
Ocean waves wearing down a sea cliff.
Erosion forming the Grand Canyon
19
How does a sedimentary rock form into a metamorphic rock?
It turns into metamorphic rock through heat and pressure.
It erodes into sediment, then deposits into metamorphic rock
It melts into magma, then erodes into sediment.
It erodes into sediment, then cools into metamorphic.
20
In which era did the first land animals evolve?
Paleozoic
Cenozoic
Mesozoic
Pre Cambrian
21
In which era did humans evolve?
Paleozoic
Cenozoic
Pre Cambrian
Mesozoic
22
Which type of rock is formed from cooled magma ?
Sedimentary
Metamorphic
Igneous
Amber
23
What is a body fossil ?
Sedimentary layers of earth
A mold or cast of a seashell
A trace of an ancient organism, like a footprint or burrow
Actual remains of past life, like bones
24
What fossil dating method compares sediment layers using the Law of Superposition?
Relative dating
Paleontology
Absolute dating
Plate tectonics
25
What is the theory that slow, gradual change forms most of Earth's features?
Law of Superposition
Uniformitarianism
Plate tectonics
Catastrophism
