1) The ozone layer, located in the Earth's stratosphere, protects us from harmful ultraviolet (UV) radiation.

2) The ocean covers about 71% of the Earth's surface and contains roughly 97% of the planet's water.

3) Sloths only poop once a week, and when they do, they lose about one-third of their body weight.

4) The Northern Lights, also known as the Aurora Borealis, are natural light displays that occur in the polar regions due to interactions between the Earth's magnetic field and solar particles.