Earth Science SOLs: Essential Understandings, Knowledge ...

Some Important Events in Earth’s History. Event # Date in Years Before Present The distance in cm, m, km, or miles (if 1 mm = 1 year) Event 1 4.56 Billion 4560 mya. 4560 / 1.6 = 2850 Earth forms 2 4.4 Billion 4400 mya. 4400/ 1.6 = 2750 Oldest mineral grain found 3 4.1 Billion 4100 mya. Oldest piece of rock ever found 4 3.9 Billion 3900 mya ................
................