There are no periods/decimals in the number one million. There are 6 zeros following the number 1. Thus, 1 million is 1,000,000
A million as a number is: 1,000,000
2
0, but there are 2 commas if thats what you mean
It is now accepted in the UK that a billion is 1,000,000,000 (one thousand million), (it used to be 1,000,000,000,000 ie, one million million). We use the comma, though I believe the period is used in the USA? Therefore, where I've shown a comma, simply assume it is a period if you are in the USA!
3 periods
None.
a million million in a trillian :)
There is actually none.
45,000,000,000,000,000,million years
0, but there are 2 commas if thats what you mean
many periods
Million
There have been at least four periods of large-scale glacial activity during the last two million years.
They are both time periods of the early Paleozoic. The Ordovician was approximately 490 million years ago, to 440 million years ago. The Silurian was approximately 440 million years ago, to 416 million years ago. The Silurian was the period immediately after the Ordovician. The two periods were divided by the second largest Mass extinction in history.
About 250 million years, from 300m to 65m, spanning three periods(Triassic, Jurassic, and Cretaceous
The Ice Age.
The Cenozoic era has three periods. These periods include the Paleogene, the Neogene, and Quaternary. This era covers a span of 66 million years ago until present time.
The Mesozoic era took place 252. 17 million to 66 million years ago. The three major periods that make up the Mesozoic era are the Triassic, the Jurassic, and the Cretaceous periods.
The Cenozoic era has three periods. These periods include the Paleogene, the Neogene, and Quaternary. This era covers a span of 66 million years ago until present time.