1. 10 The dissolved constituents chloride, sodium, sulphate, magnesium, calcium and potassium account for what per cent (%) of the dissolved constituents in seawater?
Greater than 99%
Greater than 80%
Greater than 90%
Greater than 95%
1 of 10
Other questions in this quiz
2. Why does the composition of sinking particles change with depth in the water column?
Skeletal material dissolve rapidly . Soft tissue, is consumed and decomposed by animals/bacteria only slowly. Proportion increases
Skeletal material dissolve rapidly . Soft tissue, is consumed and decomposed by animals/bacteria only slowly. Proportion decreases
Skeletal material dissolve only slowly. Soft tissue, is consumed and decomposed by animals/bacteria more rapidly. Proportion increases
Skeletal material dissolve only slowly. Soft tissue, is consumed and decomposed by animals/bacteria more rapidly. Proportion decreases
3. Which one of these has NOT been shown to exhibit HNLC behaviour
Antarctica
North East equatorial Atlantic
North west Atlantic
North Pacific
4. If the nitrate concentration increases from 6uM at 500m depth to 17uM at 1,000m depth, by how much, and in what way, would you predict the phosphate concentration to change over the same depth interval? Assume that the Redfield ratio is 106:16:1
Decrease by 0.69
Increase by 0.69
Increase by 1.45
Decrease by 1.45
5. Which of the following statements about iron fertilisation IS NOT TRUE?
Open ocean iron enrichment experiments unequivocally demonstrated that phytoplankton growth is limited by iron in HNLC areas
Bottles filled with surface water from HNLC regions and incubated at the same light and temperature as found in these surface waters, had lower amounts of chlorophyll in when iron had been added.
Iron fertilisation of the ocean is a hot topic because stimulation of biological activity leads to drawdown of atmospheric carbon dioxide.
Sequestration of anthropogenic CO2 by deliberate fertilisation of the ocean can only work if the organic carbon so produced can be exported to the deep sea.
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