Radiometric Dating Carbon Uranium

Use the table shown here to answer the following question. According to this table, if one-fourth of the original radioactive carbon is present in a fossil, what is the fossil's age?

• 2857.5 years old

• 5730 years old

• 11,460 years old

• 17,145 years old

Use the table shown here to answer the following question. Which isotope would be best for measuring the age of a rock layer estimated to be about one million years old?

• Beryllium-10

• Carbon-14

• Chlorine-36

• Uranium-235

Use the graph shown to answer this question. Which is the half-life of the radioactive isotope shown in the graph?

• 18 years

• 36 years

• 54 years

• 72 years

Tags

NGSS.HS-PS1-8

Use the graph shown to answer this question. Assuming you can only date material that has at least one percent of the radioisotope remaining, which age would be too old to date with this isotope?

• 35 years

• 50 years

• 75 years

• 125 years

How many mass extinctions have there been in Earth's history?

• 5

• 2

• 10

• 20

Tags

NGSS.HS-LS4-5

Nearly all fossils occur in what type of rock?

• Batholithic

• Igneous

• Metamorphic

• Sedimentary

Tags

NGSS.MS-LS4-1