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

2) The first commercially available digital camera, the Dycam Model 1, was introduced in 1990 and had a resolution of 376 x 240 pixels.

3) The fingerprints of koalas are so similar to humans that they have been mistaken at crime scenes.

4) The American Civil Rights Movement, led by figures like Martin Luther King Jr., fought for equal rights and helped bring about significant social and legislative changes.