EVERYDAY SCIENCE

Detailed explanation-1: -Answer and Explanation: The largest unit of geologic time is the Eon, which can be as long as a billion years. The next unit is called an Era, which is followed by a Period and lastly, an Epoch. In 2019, the Eon is the Phanerozoic, which began around 543 million years ago.

Detailed explanation-2: -The Proterozoic Eon is the most recent division of the Precambrian. It is also the longest geologic eon, beginning 2.5 billion years ago and ending 541 million years ago.

Detailed explanation-3: -eon = The largest unit of time. era = A unit of time shorter than an eon but longer than a period. period = A unit of time shorter than an era but longer than epoch. epoch = A unit of time shorter than a period but longer than an age.

Detailed explanation-4: -The four largest divisions of geologic time are the eons which include from oldest to youngest: the Hadean, Archean, Proterozoic, and Phanerozoic.

Detailed explanation-5: -Answer: Eon has the longest duration. An eon can be referred to as indefinite duration or extremely long period of time. Eons is said to have the longest duration because it is more than one era or a period or an epoch.