6.1.4: Mass Extinctions

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Multiple Choice

According to the law of superposition, the oldest fossils are found

• At the top of the rock layers

• Near the bottom of the rock layers

• Somewhat near the surface

Science Resources Padlet

Multiple Choice

Why is it challenging for scientists to determine the exact cause of the Ordovician extinction?

• 
  multiple potential causes occurring simultaneously

• conflicting geological evidence from different regions

• lack of fossil records from the Ordovician period

Multiple Choice

Which of the following is believed to be a significant contributing factor to the Cretaceous extinction event?

• asteroid impact

• glacial growth

• climate change

Multiple Choice

Fishing tuna at a rate of more than they can replace themselves is known as?

• Habitat destruction

• Pollution

• Overharvesting

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