How can knowing the ages of rocks be useful to geologists?

The agricultural revolution brought about a situation in which? Is negative 42 a rational number? Can you get visa approvel in Berlin when you have charging for shoplifting? Who wrote the decameron? Where is the serial number on a Marlin Foremost model 6660 22 rifle? How do you find a life insurance policy after the death of policy holder? What options does a team have if it hasn't gained 10 yards by the fourth down? Which celebrities favourite color is bright pink? What is 4.25 multiplied by 100? Do scallops have a heart? Where do you get the soul caliber in Fallout 3? What is the value of Winchester model 94 Centennial grade one 30 30 lever action carbine serial cn04821 in box never fired? How far into a pregnancy can a woman still have her period? How can you make girls like a chunky guy? How old was Andrew Carnegie's daughter when he died? How many days are there from May 28th and June 4th? What is the Cook County Courthouse phone number? Who did the founders give suffrage to at the time of writing the Constitution? How did the slaves find their way to escape? Which metal is suitable for bearings is subjected to heavy loads?

How can knowing the ages of rocks be useful to geologists?