Eons, eras, periods, and epochs, are all examples of .

The correct answer is Geologic.

The geologic time scale refers to a system of chronological data, which associates geological strata to time. It is used by paleontologists, geologists, and various other scientists associated with Earth studies to illustrate the timing and relationships of incidents, which have taken place during the history of the Earth.

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.

sulfur dioxide

explanation: acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. these substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain.