Geologic Time Scale

Which of the following organizes the divisions of geologic time from longest to shortest?

• eons, eras, periods, epochs

• epochs, periods, eras, eons

• periods, eons, epochs, eras

• eras, epochs, eons, periods

Which of the following is typically measured in hundreds of thousands to millions of years?

• a period

• an eon

• an era

• an epoch

Tags

NGSS.MS-ESS1-4

Which series shows the divisions of geologic time arranged in order, from longest to shortest?

• eon>era>epoch> period

• eon>era>period> epoch

• era>eon>epoch>

  period

• era>eon>period> epoch

Tags

NGSS.MS-ESS1-4

Earth is currently experiencing a period of global warming enhanced by greenhouse gases. Based on your knowledge of the effects of major climate change throughout geologic time, such as the global warming leading up to the end of the Permian period, which of the following is a reasonable hypothesis for the effect this global warming will have on Earth's ecology.

• Earth's ecology will only benefit from the warmer climate.

• Many species will be unable to adapt and will go extinct.

• The effects of global warming will not have any long-term effects on the human species.

• Global warming will likely have no effect on Earth's ecology.

Tags

NGSS.HS-LS4-5

NGSS.HS-ESS3-5

NGSS.HS-LS2-6

Which of the following is used as evidence to construct the geologic time scale?

• fossils

• radiometric age data

• comparative studies of different rock sequences

• all of the above

Which of the following could mark the boundary of a division of geologic time?

• a mass extinction

• a period of rapid evolution

• the appearance of the oldest known rocks

• all of the above

Which of the following is NOT a division of geologic time?

• eons

• periods

• generations

• epochs

Tags

NGSS.MS-ESS1-4

Which of the following is NOT a Precambrian eon?

• Hadean

• Phanerozoic

• Archean

• Proterozoic

Tags

NGSS.MS-ESS1-4

Iridium is an element that is common in meteors bur very rare on Earth. An iridium layer 65.5 million years old has been discovered in rock layers in many different locations all over the world. For which of the following hypotheses does this discovery provide evidence?

• The supercontinent Pangaea began to break apart during the Mezozoic Era.

• A glaciation event caused the mass extinction that marks the end of the Ordovician period.

• An impact event caused the mass extinction that marks the end of the Cretaceous period.

• The "Cambrian Explosion" that marks the evolution of complex organisms happened at the beginning of the Phanerozoic eon.

Tags

NGSS.HS-LS4-5

NGSS.HS-ESS2-7

Which of the following would be an example of evidence that could be used to construct the geologic time scale?

• a geologic event observed in different rock sequences around the world

• index fossils

• radiometric dating of rocks in an impact crater

• all of the above

Tags

NGSS.MS-ESS1-4