- 5.d - Students know how properties of ocean water, such as temperature and salinity, can be used to explain the layered structure of the ocean, the generation of horizontal and vertical ocean currents, and the geographic distribution of marine organisms.
Prior knowledge & experience:
Students understand that some things float and some things sink.
Why does cold water sink and warm water rise? Why does salty water sink and fresh water rise?
Because of differences in density.
Students think things may sink or float because one is a solid and the other is not.
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Middle School Science