7th Grade Unit 3 Lesson 9

What is the geologic time scale?

• a long line that you can put events on

• a model of Earth’s history divided into eons, eras, periods, and epochs

  
  

• a model of earth's history in no particular order

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NGSS.MS-ESS1-4

What is the glacial period?

• A time where the glaciers moved a lot

• Current time period because there are glaciers

• during an ice age, a time of even cooler temperatures, when large ice sheets advance from the poles toward the equator

  
  

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What is the interglacial period?

• A time where it got really cold and glaciers formed

• during an ice age, a time of warmer temperatures, when large ice sheets begin to melt and retreat toward the poles

  
  

• A time where the earth was covered in many glaciers

What is a mass extinction?

• the extinction of a large number of species over a relatively short period of time

  
  

• when an abundance of life sprigs up

• a time where there are not a loft of fossils to study

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What is the principle of lateral continuity?

• states that sediments are always randomly deposited because of different weather events

• this is the belief that rocks all stack up vertically in messy layers

• states that sediments are deposited in layers that extend horizontally in all directions until they reach an obstacle

  
  

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NGSS.MS-ESS1-4

What is the principle of original horizontality?

• states that rock layers form when sediments are deposited in horizontal layers due to gravity

  
  

• states that rocks are always horizontal no matter what happens to them

• states that we can't ever study the ages of rocks unless we know the original sediment layers

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NGSS.MS-ESS1-4

What is the law of cross-cutting relationships?

• states that rock layers cannot be studied unless you know the age of the layer that is cutting into it

• states that any layer that cut into a rock feature is older than the original feature

• states that the rock feature that cuts across another rock feature is the younger of the two features

  
  

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What is Pangea?

• A hypothetical supercontinent
• A famous painting
• A type of flower

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What is the Permian Mass Extinction?

• A period of rapid evolution of new species
• A minor extinction event around 50 million years ago
• A major extinction event around 252 million years ago

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What is the Cambrian Explosion?

• Gradual disappearance of diverse animal fossils in the fossil record during the Cambrian period
• Sudden appearance of diverse plant fossils in the fossil record during the Cambrian period
• Sudden appearance of diverse animal fossils in the fossil record during the Cambrian period

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