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In this collection of classic MinuteEarth videos, we take a look at one of Earth’s most critical - and unique - features.

We originally created the videos in the “MinuteEarth Explains” series for another project. But we know that lots of people right now are looking for really good online educational content - and something to take their mind off current events - so we decided to release them here as well. We’d love to know what you think, so leave us a comment below!

These are the episodes featured in this compilation:

0:25 - Where Did Earth's Water Come From? https://www.youtube.com/watch?v=_LpgBvEPozk

3:05 - Why Are There Clouds? https://www.youtube.com/watch?v=QC2x_RRnk8E

5:46 - Why Do Rivers Curve? https://www.youtube.com/watch?v=8a3r-cG8Wic

8:31 - UPSIDE-DOWN Rivers On Mars?! https://www.youtube.com/watch?v=yy5UpVoQDJw