
Earth History
Flashcard
•
Science
•
10th Grade
•
Practice Problem
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
What is the name of the sedimentary rock layer that was the last to form before an unconformity?
Back
The last sedimentary rock layer before an unconformity is referred to as the 'youngest layer' or 'top layer' in geological terms.
2.
FLASHCARD QUESTION
Front
Which rock unit is typically the youngest in a geological cross-section?
Back
The youngest rock unit is usually the one that is on top of the other layers, as sedimentary layers are deposited in a chronological order.
3.
FLASHCARD QUESTION
Front
What type of rock is sandstone?
Back
Sandstone is a sedimentary rock composed mainly of sand-sized mineral particles or rock fragments.
4.
FLASHCARD QUESTION
Front
Why can volcanic ash be used as a time marker in geology?
Back
Volcanic ash can be used as a time marker because it is deposited rapidly over a large area, allowing for correlation between rock layers.
5.
FLASHCARD QUESTION
Front
What is an index fossil?
Back
An index fossil is a fossil that is used to define and identify a particular time period in the geological time scale.
6.
FLASHCARD QUESTION
Front
Name a common index fossil from the Early Ordovician period.
Back
Climacograptus is a common index fossil from the Early Ordovician period.
7.
FLASHCARD QUESTION
Front
What is an unconformity in geology?
Back
An unconformity is a surface of contact between two groups of unconformable strata.
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