Geologic Time Scale
Flashcard
•
Science
•
6th - 8th Grade
•
Hard
Barbara White
FREE Resource
Student preview
18 questions
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1.
FLASHCARD QUESTION
Front
Geologic Time Scale Noun
[jee-uh-loj-ik tahym skeyl]
Back
Geologic Time Scale
A record of Earth's history organizing events and life-form development using the rock and fossil record.
Example: This chart shows the Geologic Time Scale by organizing Earth's 4.6-billion-year history into named units like eons, eras, and periods.
2.
FLASHCARD QUESTION
Front
Uniformitarianism Noun
[yoo-nuh-fawr-mi-tair-ee-uh-niz-uhm]
Back
Uniformitarianism
The principle that geologic processes occurring today have been happening since Earth formed, shaping its features over time.
Example: Fossilized ripple marks and mudcracks in ancient rock show that the same processes of water flow and drying that happen today also happened in the geologic past.
3.
FLASHCARD QUESTION
Front
Superposition Noun
[soo-per-puh-zish-uhn]
Back
Superposition
The principle that in an undisturbed rock sequence, the oldest rocks are at the bottom and get progressively younger upwards.
Example: In undisturbed rock layers, the youngest layer is on top and the oldest layer is at the bottom.
4.
FLASHCARD QUESTION
Front
Cross-Cutting Relationships Noun
[kros-kuht-ing ri-ley-shuhn-ships]
Back
Cross-Cutting Relationships
The geologic principle stating that an intrusion or a fault is younger than the rock layers it cuts across.
Example: This diagram shows a geologic cross-section where younger features, like the fault (F) and the dike (D), cut across older, pre-existing rock layers.
5.
FLASHCARD QUESTION
Front
Unconformity Noun
[uhn-kuhn-fawr-mi-tee]
Back
Unconformity
A surface representing a gap in the geologic record, where rock layers were lost due to erosion or non-deposition.
Example: This diagram shows a boundary, called an unconformity, where older, tilted rock layers were eroded before newer, flat layers were deposited on top.
6.
FLASHCARD QUESTION
Front
Correlation Noun
[kawr-uh-ley-shuhn]
Back
Correlation
The process of matching rock outcrops or geologic layers from one geographic region to another based on their characteristics.
Example: This diagram shows how geologists match similar rock layers (strata) from different locations to determine that they formed at the same time.
7.
FLASHCARD QUESTION
Front
Fossil Noun
[fos-uhl]
Back
Fossil
The preserved evidence or remains of once-living plants or animals found within the geologic rock record.
Example: This diagram shows different types of fossils found in distinct layers of rock, which helps scientists determine the relative age of the rocks.
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