In the lab, researchers can tell the age of rocks because some atoms of potassium within rocks decay over time to form argon gas, which becomes trapped in rock crystals.
(researchers; can tell; the age of rocks; because some atoms of potassium within rocks decay over time; L:In the lab) (some atoms of potassium within rocks; decay; T:over time) (argon gas; becomes; trapped in rock crystals)
researchers some atoms of potassium within rocks argon gas
can tell decay becomes
the age of rocks because some atoms of potassium within rocks decay over time L:In the lab
T:over time
trapped in rock crystals