Lesson #6 (Early Earth and the Moon) Worksheet #4 Relative Dating Activity Worksheet Relative Time By knowing the age of the rock that a fossil is found in. Relative Dating Activity. How can you determine the sequence of past events? Earth is very old and many of its features were formed before people came along . 3 Relative AGE Before absolute dating of rocks was developed in the 20th century, geologists had to rely on relative age dating, which places geologic events in.