MinuteEarth
Why Do Rivers Have Deltas?
Where rivers meet the ocean, coastlines tend to bend either inward or outward, creating estuaries and deltas. But how do they get those shapes? A huge thank-you to the following organizations, all working toward sustainable deltas, for...
Khan Academy
Earth Formation, Life on Earth and in the Universe, Cosmology and Astronomy
How was our solar system and Earth formed? Sal hypothesizes that a Supernova was most likely the catalyst that spawned our sun and, consequently, our solar system. He thoroughly explains the formation of the moon and the Earth using a...