dating planets

Question 1

age of earth

Answer 1

4550 million

Question 2

method used to date a planet

Answer 2

radiometric dating - decay of radioactive isotopes

Question 3

what does radiometric dating use to get age

Answer 3

1) half life (rate at which the radio active isotope decays)

2) amount of the radioactive isotope incoprated in object when it formed

Question 4

accurate?

Answer 4

degree of uncertainty, usually