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العلوم الصفوف 5–6

Geologic Time and Relative age dating

Superposition cross-cutting inclusion unconformities correlation principle index fossiles

شاركها Ahmad Alsalloum منذ ساعتين 10 س اعتُمدت 0 مرة 1 مرة لعب لعبها 17 طالب
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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

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