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 tectonic activity. 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 significantly impact Earth's climate, biodiversity, and geological processes. When continents merge, they create vast land areas that can influence weather patterns and ecosystems. The cycle of supercontinent formation and breakup is a key aspect of the planet's geological history, shaping the continents we see today.