Which word means "the remains or imprints of once-living organisms found in layers of rock

co2reflects heat radiation back to earth buning coal and oil emits co2 globe warms

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.