Oceans

A measure of the amount of dissolved salt contained in water

• Salinity

• Oceans

• Sonar

• Seamounts

A very large expanse of sea, in particular, each of the main areas into which the sea is divided geographically

• Upwelling

• Crest

• Oceans

• Density

A system that uses sound waves to measure distances and locate objects.

• Salinity

• Condensation

• Ocean Current

• Sonar

Underwater mountains

• Mid-ocean-ridge

• Seamounts

• waves

• crest

A wide flat area of the ocean floor that is covered with a thick layer of sediment

• Ocean trenches

• Abyssal Plain

• Volcanic Island

• El Niño

Underwater volcanoes tall enough to reach above the surface

• Topography

• Longshore current

• Continental slope

• Volcanic Island

The flat or gradually sloping land that extends underwater from the edge of a continent to a continental slope

• Rip current

• Waves

• Continental Shelf

• Wave length

land that drops down steeply at the edge of a continental shelf

• Continental slope

• Topography

• Ocean trenches

• Downwelling

all natural and human-made surface features of a particular area

• Mid-ocean-ridge

• Topography

• Trough

• Waves

narrow steep sided clefts in the ocean floor

• crest

• ocean current

• rip current

• Ocean trenches