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과학
초등 5–6학년
Geologic Time and Relative age dating
Superposition cross-cutting inclusion unconformities correlation principle index fossiles
Ahmad Alsalloum 님이 공유
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1
What does the principle of superposition state about rock layers?
A
Rock layers are always the same age no matter where they are found
B
The thickest rock layer is always the oldest
C
In an undisturbed sequence, older layers are on the bottom and younger layers are on top
D
Rock layers form only during volcanic eruptions
2
A geologist finds a layer of sandstone that is cut by a crack filled with lava that has hardened into igneous rock. According to the principle of cross-cutting relationships, which is younger?
A
It is impossible to tell
B
The sandstone layer
C
The igneous rock in the crack
D
They are the same age
3
You find a rock containing a piece of another rock inside it. What does the principle of inclusions tell you about their ages?
A
The inclusion and the rock are the same age
B
The inclusion formed after the rock cooled
C
The inclusion is younger than the rock containing it
D
The inclusion is older than the rock containing it
4
What is an unconformity in a rock sequence?
A
A place where two rock layers are exactly the same age
B
A type of fossil found only in igneous rock
C
A rock layer that contains no fossils
D
A gap in the rock record where erosion or non-deposition occurred
5
Which of the following best describes relative age dating?
A
Measuring the temperature of rocks to find their age
B
Determining the exact number of years since a rock formed
C
Putting rocks and events in order from oldest to youngest without knowing exact ages
D
Finding the location of rocks on a map