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about properties of water,composition of ocean, and ocean currents
Question | Answer |
---|---|
true or false. wind and currents move in opposite directions. | false, they move in the same direction. |
can surface currents carry warm or cold water? | surface currents can carry both along the ocean. |
what influences the direction currents move? | prevailing winds. |
what is a gyre? | a circular system of currents. |
what direction do gyres spin in the northern hemisphere? | clockwise. The southern spins counterclockwise. |
why do gyres spin in different directions? | Because of the Coriolis Effect (earths rotation.) |
can currents move vertical or only horizontally? | currents can do both- horizontal because of upwelling and density currents. |
what is the great ocean conveyer belt? | large system of ocean currents that affects weather and climate. (like gyres) |
water molicules stick together well because of _______ | cohesion. |
what temperature is water highest density? | 4*C |
why is water a solvent? | because it can mix with many other substances. |
what is polarity? | is a condition where opposite ends of a molecule have a little bit of opposite charges, but the overall charge of the molecule is neutral. |
does ice expand or contract as a solid | it expands unlike most solids. |
how can water be found on earth that makes it special. | it can be found as all three states (gas, liquid, solid.) |
what is adhesion? | the attraction among molecules that are NOT alike |
what is water atom composition made of. | 2 slightly negative hydrogen one slightly positive oxygen |
what is the sea floor like? | large mountains and vallies and also plains. Active volcanoes that will create more land someday. it is very dark with animals that create their own light. |
what made the ocean salty? | minerals that formed salt carried into rivers/ streams into ocean basins. |
what covers the abyssal plains? | thick layers of sediment. |
what are abyssal plains? | large and flat areas on the sea floor. |
where is brackish water? | where a sea or ocean (salty) meets a stream or river (fresh water.) |
what are submersible? | an under water vessel that can go great depths to explore the ocean floor and stand the pressure. |
who uses submersibles? | scientist to learn about ocean floor |
about when did oceans start to form | as early as 4 billion years ago |