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Ocean

Across
the complex of a community of organisms and its environment functioning as an ecological unit
longitudinal pressure waves in any material medium regardless of whether they constitute audible sound
a science that deals with the oceans and includes the delimitation of their extent and depth, the physics and chemistry of their waters, marine biology, and the exploitation of their resources
a method or device for detecting and locating objects especially underwater by means of sound waves sent out to be reflected by the objects
Down
Made huge contribution to our understanding of oceans
the whole body of salt water that covers nearly three fourths of the surface of the earth
a usually small underwater craft used especially for deep-sea research
having or showing assurance and self-reliance
used for an underwater breathing apparatus
a chain of rocks or coral or a ridge of sand at or near the surface of water