The term 'Surface EARTH' can be broken down into two crossword solutions: 'OCEAN' (5 letters) and 'EARTH' (5 letters). The OCEAN is a large body of salt water that covers approximately 70% of the EARTH's surface. It is divided into four major oceans: the Pacific, Atlantic, Indian, and Arctic. The EARTH is the third planet from the Sun and is the only known planet to support life. It is composed of land, air, and water, and its surface is constantly changing due to natural processes such as erosion and weathering.