20 million years ago
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The earth formed around 4.2 billion years ago, but it would have been too hot for water to liquidize at that point. I think around 3.8 billion years ago, but this is easy to look up online.
Biomass fuel is created from organic materials like plants and trees that grew relatively recently, typically within the past few years. This makes biomass a renewable source of energy unlike fossil fuels which were created millions of years ago.
few days ago
Galaxies began forming around 13.6 billion years ago, not long after the Big Bang that created the universe. Over time, gravity caused matter to clump together, eventually forming the galaxies we observe today.
The record rainfall occurred about [x] years ago.