Answer:
Scientists used major changes in life forms in the fossil record to form the geologic time scale.
Answer:
The highest high tides, and lowest low tides occur during a new/full moon.
Explanation:
This is also called spring tides where you have two extreme types of tides. These tides happen when the sun, moon, and earth line up.
They give us informations about our ancestors and how did they live and what did they do and than compare it to present way's of life.
Natural: Grand Canyon.
Man made: London bridge