This website contains age-restricted materials including nudity and explicit depictions of sexual activity.
By entering, you affirm that you are at least 18 years of age or the age of majority in the jurisdiction you are accessing the website from and you consent to viewing sexually explicit content.
This is the coolest thing I’ve learned all month!
It probably even happened multiple times, so Earth went from purple to green, back to purple and then green again. And there’s also been periodes where the Earth was mostly covered in ice, making it appear white, called Snowball Earth.
Geo Girl on YouTube has excellent videos about this topic: https://www.youtube.com/watch?v=5sQPcpsOWzg PBS Eons is a good source for a high level overview as well: https://www.youtube.com/watch?v=IIA-k_bBcL0