1. Geologic time periods are divided into segments based on two pieces of information. Describe them.

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Answer 1

Geologic time periods are divided into segments based on two pieces of information: relative dating and absolute dating.

1. Relative dating: Relative dating involves determining the age of rocks and fossils in relation to other rocks and fossils. It is based on the concept of superposition, which states that in undisturbed layers of rock, the oldest rocks are located at the bottom while the youngest rocks are found at the top. By studying the layers of rock and the fossils within them, geologists can establish a relative timeline of events and assign them to specific time periods.

2. Absolute dating: Absolute dating involves determining the exact age of rocks and fossils by using techniques that measure the decay of radioactive isotopes. This method provides numerical ages for the rocks and fossils, allowing geologists to assign specific dates to different periods in geological time. Absolute dating techniques such as radiometric dating can provide precise ages, helping scientists establish a more accurate and detailed timeline of Earth's history.