About sea
The sea in a general sense refers to the ocean or world ocean, the body of salty water that covers approximately 71% of the Earth's surface. Used in a particular sense the word sea refers to particular seas either as second-order sections of the ocean, such as the Mediterranean Sea, or as certain large, entirely landlocked, saltwater lakes, such as the Caspian Sea. The sea moderates Earth's climate and has important roles in the water, carbon, and nitrogen cycles. Humans harnessing and studying the sea have been recorded since ancient times, and evidenced well into prehistory, while its modern scientific study is called oceanography. The most abundant solid dissolved in seawater is sodium chloride. The water also contains salts of magnesium, calcium, potassium, and mercury, amongst many other elements, some in minute concentrations. Salinity varies widely, being lower near the surface and the mouths of large rivers and higher in the depths of the ocean; however, the relative proportions of dissolved salts vary little across the oceans.

Sea

body of water during daytime
body of water during daytime
clear blue body of water
clear blue body of water
cave viewing of cliff during daytime
cave viewing of cliff during daytime
green trees on island surrounded by water during daytime
green trees on island surrounded by water during daytime
aerial view photography of sea
aerial view photography of sea
photo of brown wooden boardwalk nearby sea
photo of brown wooden boardwalk nearby sea
ocean sea waves on seashore
ocean sea waves on seashore
time lapse photography of body of water
time lapse photography of body of water
white starfish on sand underwater during daytime
white starfish on sand underwater during daytime
crystal clear water near coconut trees under the sun
crystal clear water near coconut trees under the sun
beach during daytime
beach during daytime
rocks on sea side at daytime
rocks on sea side at daytime
sea waves splash on rock formation at daytime
sea waves splash on rock formation at daytime
photo og calm body of water
photo og calm body of water
black sand near body of water under the cloudy sky during daytime
black sand near body of water under the cloudy sky during daytime
Seascape of the ocean foam
Seascape of the ocean foam