Over 3/4 of the earth's surface is covered with water, making the oceans and seas an obvious attraction for the human species. Swimming, sunbathing, clam digging, boating, and fishing are just a few ways to enjoy the world's oceans and the creatures.Over 3/4 of the earth's surface is covered with water, making the oceans and seas an obvious attraction for the human species. Swimming, sunbathing, clam digging, boating, and fishing are just a few ways to enjoy the world's oceans and the creatures.