Think about how the geologic time scale was created and how it is divided. Then answer the following questions.
-How did scientists form the geologic time scale?
-How is this scale organized?
-What processes changed Earth’s surfaces during Precambrian time?
Answers
Answer:
The used the estimated age of earth up to present as the scale. It is organized with Eons, Eras, Periods and Epochs. Eons the longest and Epochs the shortest.
Geologists have divided Earth's history into a series of time intervals. These time intervals are not equal in length like the hours in a day. Instead the time intervals are variable in length. This is because geologic time is divided using significant events in the history of the Earth.
For example, the boundary between the Permian and Triassic is marked by a global extinction in which a large percentage of Earth's plant and animal species were eliminated. Another example is the boundary between the Precambrian and the Paleozoic, which is marked by the first appearance of animals with hard parts.
A biochemical process known as photosynthesis—a move that would ultimately lead to simple plants and which opened the planet up to animal life. Some three billion years ago, the Earth's atmosphere was virtually devoid of oxygen.
Explanation: