quiz: lo #2 and #3 unit 8 (Earth's history)

The Geologic Time Scale is a record of what?

• old geologists
• sweet geology music
• the known history of rocks and fossils
• a list of every living thing ever

Which unit of geologic time scale is the longest?

• Epoch

• Period

• Era

• Eon

Fossil Evidence shows that there have been ​​ (a)   major mass extinction events where ​ (b)   of the current species become extinct.

• 5
• 75%
• 10
• 3
• 50%
• 95%

Which of the following is believed to be the primary cause of the Permian extinction, the largest mass extinction event in Earth's history?

• Massive volcanic eruptions and release of greenhouse gases

• Overhunting and overfishing by early humans

• A massive asteroid impact

• Aliens invaded Earth

Approximately (a)   years ago a(an) ​ (b)   wiped out the dinosaurs in the Cretaceous extinction.

• 65 million
• asteroid
• 200 millon
• 440 million
• supernova
• aliens

Which of the following is a primary cause of the 6th mass extinction event, which is currently underway and threatening many species with extinction?

• Overexploitation by humans

• Ice Age

• Asteroid impact

• Volcanic activity

Based on current scientific evidence, how old is the Earth?

• 6,000 years old

• 2.0 million years old

• 4.6 billion years old

• 3.8 billion years old

Which of the following is a commonly used isotope in radioactive dating?

• Carbon-14

• Iron-56

• Oxygen-18

• Helium-4

Which of the following best describes radioactive dating?

• Radioactive dating uses radioactive isotopes to determine the age of rocks and fossils.

• Radioactive dating uses radioactive materials to determine their chemical properties.

• The process of determining the relative age of things by comparing the ages of different strata.

• none of these choices are correct

The time required for half of carbon-14 to decay into nitrogen-14 is called a ________.

• Absolute Age

• Relative Age

• Fossil

• Half-life