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 division of the geologic column into different periods is largely based upon the varieties of fossils found, taken as indicators of a time period in Earth's history. Quaternary Period, Cenozoic Era, Phanerozoic Eon [1.8 Myr - 0 ]