the total quantity of dissolved salts in water

salinity

a compound made of hydrogen and oxygen

water

small organisms that drift through bodies of water; include animals, plants, and bacteria

plankton

water that is not fresh; water that has things dissolved in it that make it taste salty

salt water

having to do with the ocean

marine

a coastal body of water where fresh water from a river mixes with salt water from the ocean

estuary

the force per unit area exerted on an object

pressure

a large body of salt water that covers most of Earth

ocean

an object's mass divided by its volume; a measure of how many particles are packed together into a certain amount of space

density

large-scale movement of water within the oceans in a certain direction

ocean current

a depression in the ocean floor that ranges from a few feet to several miles in depth

ocean basin

a substance in which all of the parts are the same throughout

homogeneous