A supercontinent is a large landmass that consists of multiple continental plates joined together. Throughout Earth's history, supercontinents have formed and broken apart due to the movement of tectonic plates. The most well-known supercontinent is Pangaea, which existed around 335 million years ago and began to break apart about 175 million years ago. Supercontinents can influence global climate, ocean currents, and biodiversity. When continents merge, they create vast land areas that can lead to the development of unique ecosystems. The cycle of supercontinent formation and breakup is a key aspect of Earth's geological history, impacting the planet's landscape over millions of years.