The term 'very large amount' can be summarized by the crossword solution 'OCEAN, ' which is a five-letter word. An OCEAN is a large body of water that covers most of the Earth's surface and is divided into four major oceans: the Pacific, Atlantic, Indian, and Arctic. Oceans are home to a wide variety of life and are an important source of food, energy, and minerals. They also play a major role in regulating the Earth's climate.