How is water so deep?

Water can be deep due to the presence of large bodies of water, such as oceans and seas, which are formed by geological processes over millions of years. The depth of these water bodies is influenced by factors like tectonic activity, erosion, and sedimentation. Oceanic trenches, for example, can reach depths of over 36,000 feet due to plate tectonics. Additionally, the vastness of these water bodies allows for significant variations in depth, resulting in areas that are much deeper than others.