Oceanography and Hydrology

Sea grasses stabilize coastal ecosystems by trapping sediment, reducing wave energy to prevent erosion, and producing oxygen. They do not elevate water temperature, which is regulated by solar radiation and ocean currents.

Sea grasses are flowering plants that require sunlight to perform photosynthesis and produce energy. Because of this requirement, they are restricted to shallow coastal waters where sunlight can easily penetrate.

It is true that marine organisms, primarily phytoplankton, kelp, and algal plankton, produce between 50% and 80% of the oxygen in Earth's atmosphere through photosynthesis.

Although the ocean covers over 70% of the Earth's surface, scientists estimate that only about 15% to 20% of all species live in the ocean. The vast majority of Earth's species live on land, largely driven by the immense diversity of terrestrial insects.

Despite modern advancements, less than 20 percent of the ocean floor has been mapped with high-resolution sonar technology. The remainder is mapped primarily using satellite altimetry, which provides much lower resolution.

Approximately 97 percent of Earth's water is saline and stored in the oceans. The remaining 3 percent is freshwater, mostly locked up in glaciers, ice caps, and underground aquifers.

Bycatch is defined as the incidental capture of non-target species, such as dolphins, turtles, seabirds, or unwanted fish, during commercial fishing operations.

The sentence contains two contrasting clauses: one about living reefs and one about dead reefs ("others are dead"). The subordinating conjunction "while" is required to connect these two clauses and establish the contrast. Without "while", the sentence would be a run-on with two independent clauses joined only by a comma.

Approximately 97% of Earth's total water supply is saline water found in the oceans. Only about 3% is freshwater, and most of that is locked up in glaciers and ice caps, leaving very little accessible liquid freshwater.

A delta is a low, flat landform created by the deposition of sediment at the mouth of a river where it meets a slower-moving body of water. It is not a water current, but rather a geographical feature formed because the river's current slows down.

Sea caves are formed by the forces of marine erosion, where waves continuously strike weaknesses or cracks in the cliff face. Over time, this hydraulic action and abrasion hollow out the rock to form a cave.

The four primary branches of marine science (or oceanography) are physical oceanography, chemical oceanography (marine chemistry), geological oceanography (marine geology), and biological oceanography (marine biology). While marine physiology is a sub-discipline within marine biology, it is not considered one of the four main foundational disciplines.

The northern tip of the Bay of Bengal is home to the massive Ganges-Brahmaputra Delta, where rivers regularly flood and deposit rich, mineral-heavy silt onto the land. This process of alluvial deposition creates some of the most fertile agricultural soil in the world.

Red tides are caused by the rapid multiplication of red dinoflagellates like Gonyaulax, which release toxins that can kill marine life.

Diatoms are the chief producers in the oceans. They are microscopic algae that perform photosynthesis and form the base of the marine food web.