not known. It can only be said that based on observation, if sufficient dissolved silicate is present in surface water, it will be diatoms that flourish. Only when silica has been depleted from the water do other plant types come to the fore. - Broecker and Peng (1982), Tracers in the Sea

be to exploit this information. - Broecker and Peng (1982), Tracers in the Sea

production and the extent of solution of opal and calcite are related to the distribution of nutrient constituents in the sea, the abundance patterns of these phases in sediments offer valuable clues regarding the operation of the Earth's largest chemical plant. Our major goal in this chapter will

Sea

these metals at depth in the sediment column, coupled with upward migration and redeposition in the oxygenated upper layers of sediment. This material is also a by-product of hydrothermal activity near the ridge crests. - Broecker and Peng (1982), Tracers in the Sea

the sea floor. - Broecker and Peng (1982), Tracers in the Sea

meters, and SO forth. The members of the eleventh generation currently dot the surface (working from birth to death to keep their heads above the ever accumulating snow). - Broecker and Peng (1982), Tracers in the Sea

average lifetime of these colonists was 100 years. Thus over the 1000 years of occupation, about 100 people should have died and become buried in the snow on the site of his excavation. The first generation of pioneers lay in the lowest 30 meters of his excavation, the second in the overlying 30

partly depleted. The degree of depletion depends on the relationship between the biochemical demand and the ocean availability of the particular constituent. - Broecker and Peng (1982), Tracers in the Sea