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By M P M Reddy

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Gradually with the passage of time, several factors, such as energy from space and the decay of radioactive elements, contributed to raising its temperature. The process of heating continued for several hundred million years until the temperature at the centre of the earth was high enough to melt iron and nickel. 8 Comparative account of the major ocean Ocean Atlantic Pacific Indian Surface area (km2) 82,400,000 165,200,000 73,400,000 the earth’s core, displacing lighter, less dense elements and eventually raising the core temperature to approximately 2,000 °C.

7 Common brackishwater phytoplankton with unique shape and configuration planktonic through out the life cycle are as follows: (1) diatoms, (2) dinoflagellates, (3) coccolithophores, (4) selective species of blue-green algae and (5) some species of green algae. The members of phytoplankton community have unique size, shape and morphological features (Fig. 7). Diatoms These floating plants are all microscopic in size and are characterized by the presence of shell or frustule. The shell or frustule is composed of translucent silica.

In other words, phytoplankton respond very rapidly to changes in their environment. 2 Biodiversity of the Blue Zone Phytoplankton sometimes may cause adverse impact on the marine and estuarine environment. ) and kelp. Furthermore, when the phytoplankton eventually die back and break down, an excessive amount of oxygen is required to fuel this process, and hence, areas may become deprived of oxygen. Excessive nutrients, and/or changes in their relative concentrations, may be one factor in a chain of events leading to changes in the species composition of the phytoplankton communities.

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