GEOLOGY

Detailed explanation-1: -The uppermost zone, from the sea surface to a depth of 200 m (656 ft), is called the epipelagic or photic zone. The large amount of available sunlight makes this the most productive zone of the ocean.

Detailed explanation-2: -The producers in all oceans, including the coral reefs, are mainly algae and phytoplankton, microscopic photosynthetic organisms that produce food from water and sunlight.

Detailed explanation-3: -There are five types of ocean plants: phytoplankton, red algae, kelp, seagrass, and sargassum. These sea plants fall into three groups: euphotic (sunlight), disphotic (twilight), and aphotic (midnight). Which group they are in is dependent on how much sunlight they need to survive and grow.

Detailed explanation-4: -The top zone is the euphotic or sunlit zone. This is the ocean zone that sunlight penetrates. Because this zone gets sunlight, photosynthesis can occur and plants can grow here. The sunlit zone goes down to about 660 feet.