Geological Time Scale - Study Guide

Is the Jurassic or Cambrian period the oldest?

• Jurassic

• Cambrian

Tags

NGSS.MS-ESS1-4

What is the most recent Era?

• Paleozoic Era

• Mesozoic Era

• Cenozoic Era

Tags

NGSS.MS-ESS1-4

Match the following eras with their respective time periods:

• 65 mya - present

• Paleozoic Era

• 250-65 mya

• Mesozoic Era

• 544-245 mya

• Cenozoic Era

Tags

NGSS.MS-ESS1-4

Humans show up during which Era?

• Paleozoic Era

• Mesozoic Era

• Cenozoic Era

Absolute Age- Age of fossil or rock is given in ______ instead of relative terms.

Half-Life is the amount of TIME it takes for ​ (a)   of atoms of a radioactive element to ​ (b)   and turn into a new, stable element.​

• half
• all
• none
• decay
• roast

Tags

NGSS.HS-PS1-8

A fossil has gone through 2 half-lives and contains 75% daughter material that has a 20,000 year half life. How old is the fossil?

• 10,000 years

• 20,000 years

• 30,000 years

• 40,000 years

A scientist found a fossil and sent it to a lab to determine how old it was. The lab sent back this report. “Your fossil contains Carbon-14 and has been through 4 half lives. The half life of Carbon-14 is 5,730 years.” How old is the fossil?

• 22,920 years

• 11,460 years

• 5,730 years

• 2,865 years

Radioactive Isotopes are the parent isotopes, the number of parent isotopes __________ over time?

Tags

NGSS.HS-PS1-8

Stable Isotopes are also called daughter isotopes, these __________ over time?