Question

A particular estuary shows periodic changes in the coloration of water. During the summer, water in the estuary appears greener than in winter

What can be the cause of this cyclic change in water color?

Answer 1

Algal growth could make the water appear greener.

Answer 2

B. The change in color is caused by the decrease of the growth of phytoplankton during winter.

Step-by-step explanation:

When water looks green, it is because there are a lot of microscopic algae called phytoplankton growing near the surface.

Phytoplankton get energy from sunlight, during winter their contribution of photosynthesis is greatly reduced, and a lot of the algae die during the winter, making the water less green.