Index Fossils, Correlation, Radioactivity

What is Half-life?

• The amount of time it takes for some of the nuclei in a sample of the isotope to decay
• The amount of time it takes for half the electrons in a sample of the isotope to decay
• The amount of time it takes for half the nuclei in a sample of the isotope to decay
• the amount of time it takes to double the nuclei in a sample of the isotope to decay

Tags

NGSS.HS-PS1-8

You have 100 grams of radioactive C-14. The half life of C-14 is 5730 years.

How many grams are left after 1 half life?

• 100 grams

• 25 grams

• 2 grams

• 50 grams

After the third half-life, how much of the sample is left?

• 1/2

• 1/3

• 1/16

• 1/8

Tags

NGSS.HS-PS1-8

What percent of carbon-14 would be left after 5730 years?

• 100%

• 75%

• 50%

• 25%

Tags

NGSS.HS-PS1-8

To be considered an index fossil, it had to have lived for a relatively short period of time.

• True
• False

Tags

NGSS.MS-ESS1-4

NGSS.MS-LS4-1

Does the picture represent relative or absolute dating?

• relative
• absolute

Tags

NGSS.MS-ESS1-4

An organism that no longer exists on Earth is called

• Decayed
• Evolved
• Extinct
• Preserved

Tags

NGSS.MS-LS4-1

The best index fossils have which two traits?

• widespread geographically, long lifespan
• widespread geographically, short lifespan
• specific place, long lifespan
• specific place, short lifespan

How old do Paleontologists believe the Earth is?

• 2015 years old
• 3.6 billion years old
• 4.6 billion years old
• 4.6 million years old

Tags

NGSS.MS-ESS1-4

Examine the image here. Hint: Use the slides to get a better view. Which organism appeared last?

• Gastropod

• Trilobite

• Crinoid

• Fern

• Ammonite

Tags

NGSS.MS-LS4-1

NGSS.MS-LS4-2