Absolute dating of rocks by decay of radioactive elements - Radioactive isotopes in minerals are created at the time that the mineral cools from a magma or a lava into an igneous rock.
(Absolute; dating; of rocks) (Absolute; are created; T:at the time) (the mineral; cools; T:the time)
Absolute Absolute the mineral
dating are created cools
of rocks
T:at the time
T:the time