Best Answer: Hi, Answer: estÃ¡ means is. Comments: There are two words for is in Spanish: estar and ser. EstÃ¡ is the third person singular, present indicative ...
The Largest division in the geological time scale is the Precambrian Era.It lasted from around 4.6 billion years ago to 570 million years ago.
The Geologic Time Scale and a Brief History of Life on Earth. The Geologic Time Scale is divided into four major units: Eons, Eras, Periods and. Epochs. An Eon is the longest division of geologic time, so long in fact that there have only. been four Eons. Collectively the first three eons are called the Precambrian, that stretch of.