How do major events help geologists organize Earth’s history?

There are two important tools that geologists use to portray the history of the Earth: the geologic time scale and paleogeographic maps. The geologic time scale is a standard timeline used to describe the age of rocks and fossils, and the events that formed them.

Explanation:

it cools slower in the earth meaning the crystals have more time to form than lava on the surface

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.