Answer:
Radioactive isotopes are unstable and will decay. ... The isotopes will decay into a stable isotope over time. Scientists can tell how old the rock was from looking at the radioactive isotope's half-life, which tells them how long it would take for there to be half the radioactive isotope and half the stable isotope.
Latitude.
It is measured with 180 degrees imaginary lines that form circles around the Earth east west, parallel to the Equator. These lines are known as parallels.
Answer:
A- It is a required subject in evry school
B-agriculture
Explanation:
Desert. lots and lots of desert. all desert
