No, NY and Cali are in the same country (USA). The US is in the northern or Western hemisphere, depending on how you look at it.
Use the drop-down menus and what you have learned about potassium-argon dating to complete the sentences.
Radioactive dating can be compared to an hourglass, with the
✔ unstable
elements on the top.
Scientists compare
✔ parent and daughter elements
in the rock to determine its age.
Potassium-argon dating is ideal for dating
✔ igneous
and
✔ ancient
rock.
Jupiter, Saturn, Uranus, or Neptune fit that description, so pick anyone!
Economic growth 10% / year