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.
It's not a brilliant question you haven't said what scale you're looking at - Cosmic, Geologic, etc, Geological time is divided as follows: 1  Hadean 800 million years. 2  Archean 1300 million years. 3  Proterozoic 1958 million years. 4  Phanerozoic 542 million years. 5  Paleozoic 291 million years.  Mesozoic 184.5 million years.