1) The phenomenon known as "black holes" occurs when matter is crushed into an infinitely small space, creating a gravitational pull so strong that nothing can escape.

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

3) The word "school" contains two vowels: O and O.

4) Mountains are formed through various geological processes, including tectonic plate movements, volcanic activity, and erosion.