| A | B |
|---|
| hydrosphere | all the Earth's water |
| salinity | measure of the amount of salt in water |
| oceanography | study of the physical, chemical, and biological characteristics of the seas and oceans |
| sonar | method of using sound to measure depth or to find objects in the water |
| continental margin | contains continental shelf, slope and rise |
| continental shelf | gently sloping edge of the continent covered by water |
| continental slope | steep slope of the ocean floor between the continental shelf and rise |
| ocean basin | contains the abyssal plains, mid ocean ridge, rift valleys, and seamounts |
| abyssal plain | deep, somewhat flat part of the ocean bottom |
| mid ocean ridge | an underwater volcanic mountain chain |
| rift valley | a valley in the mid ocean ridge |
| seamount | a mountain below the waves |
| guyot | flat topped seamount |
| trench | deepest part of the ocean floor |
| thermal vents | fountains of hot water that shoot from the ocean floor |
| waves | up and down movement of surface water |
| tide | repeated rise and fall of the level of the ocean |
| current | rivers of water that move through the ocean |
| upwell | where cold water rises from the deep to replace surface water |
| tsunami | wave caused by an earthquake |
