Exam 9: Oceans: The Last Frontier

Sketch a cross-section through a continent that has an active margin on one side and a passive margin on the other side. Label relevant features and briefly (one or two sentences)describe what distinguishes the two kinds of continental margins.

Where would you go to find "black smokers" (deep sea hydrothermal vents)?

The average salinity of seawater is 3.5%.

Manganese nodules are an example of ________ sediment.

Match the items in the first column with the correct descriptions in the second column. A)sediment derived from the weathering of rock, mainly on the continents B)sediment derived from dissolved salts in seawater C)a layer of rapid temperature change D)the multi-disciplinary science that studies the oceans E)a layer of rapid density change F)the oceanic equivalent of topography: the three-dimensional "shape" of the seafloor G)a measure of the amount of dissolved salts in a given volume of water H)sediment from the shells or skeletal material of living organisms -1)oceanography 2)salinity 3)thermocline 4)pycnocline 5)bathymetry 6)terrigenous 7)hydrogenous 8)biogenous