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Oceanography
6th grade defintion
Question | Answer |
---|---|
The Atlantic Ocean is bordered by which continents | Africa, South America, North America, and Europe |
continental shelf | slopes down gently from the edge of the continent mostly no deeper than150 meters |
continental slope | slopes steeply from the continental shelf; it can drop down to 2,000 meters |
submarine canyon | steep v-shaped canyon that cuts through the continental slope and the shelf |
abyssal plain | flattest place on Earth |
seamounts | sharp inactive volcanos |
guyot | a seamount that waves smash into and create a flat top |
mid-ocean ridge | longest mountain chain in the world; site of sea floor spreding |
rift valley | deep valley in the mid-ocean ridge |
deep-sea trench | subduction occurs here |
salinity | measure of the amount of dissolved salts in a given amount of liquid |
sonar | sound navigation and ranging |
desalination | a prossese of removing salt from ocean floor |
ocean currents | movement of ocean water that follows a regular patteren |
surface currents | horizontal movement of ocean water that is caused by wind and that occurs or near the ocean's surface |
the Coriolis effect | apparent curing of a path of a moving object from an other wise straight path due to the Earth's rotation |
deep current | a stream like movement of ocean water far below the surface |
tide | periodic rise and fall of the water level in the oceans and other large bodies of water |
what does "thermocline" mean | transition between light and darkness |
where is the thermocline | 300m-700m below sea level |
what is the end of the surface zone and begin the transition zone | 300m |
what is the range of temp. in the deep zone | one degrees celsius thought three degrees celsuis |
the ------ ocean is the largest ocean | Pacific |
the -------- ocean is the smallest ocean | Artic |
the ------- ocean is getting larger because -------- | Atlantic; of a divergent boundary ( mid-ocean ridge ) |
the ------- ocean is getting smaller because ---------- | Pacific; the convergent boundary (subduction) |
the surface zone has the highest----- level | salinity |
the deep zone is the most ----- zone | dense |