Earth and its distinct terrains have been formed over the course of millions of years. Sometimes an entire mountain range can be formed due to earthquakes caused by the movement of tectonic plates while at other times, a volcanic eruption can build new islands.
While we may have been a few million years late to observe how the Himalayan mountain range or the Andes had formed, scientists have discovered a 'baby' island in the Central Tonga islands, which is currently in its infancy.