6. How did the scientists first developed the geologic time scale? * by studying rock layers and index fossils
by studying the water system
by studying the atmospheric phenomena
by studying the oldest species of plants and animals
7. What is NOT TRUE of Geological Time Scale? *
divided into a series of time intervals which are different in length
timeline starting from the oldest to recent time
divided according to the significant events in the history of Earth
calendar” for events in Earth’s history
8. What have allowed geologists to correlate rock units globally? *
the timing and relationships between events
division of time into periods and then into epochs
the detailed studies made of rocks throughout the world
have fossil evidence of simple organisms