Most of us have dropped a rock into the water and watched waves radiate outward. Tsunami waves are also formed from a disturbance and waves that radiate out from the source. Imagine the amount of energy that was required to start the massive movement of water that became the deadly March 2011 Honshu, Japan tsunami.
Ocean & coasts education resources
While there is only one global ocean, the vast body of water that covers 71% of Earth is geographically divided into distinct regions. The United States recognizes five named ocean basins: Arctic, Atlantic, Indian, Pacific, and Southern.
The ocean and large inland lakes play an integral role in many of the Earth's systems, including climate and weather. More than 50% of all species on Earth are found under the ocean and the ocean helps sustain human life above the water by providing 20% of the animal protein and 5% of the total protein in the human diet. In the United States alone, there are over 95,000 miles of shoreline. More than half of the U.S. population lives within 50 miles of the coast in the narrow area of land known as the "coastal zone."
Where does all that trash come from? Where does it go? Much of it ends up on our beaches washed in with the waves and tides, some sinks, some is eaten by marine animals mistaking it for food. Other forms of pollution impacting the health of the ocean come from a single known sources like an oil spill or from accumulation of many dispersed sources like fertilizer from our yards.
On April 20, 2010, an explosion on the Deepwater Horizon/BP MC252 drilling platform in the Gulf of Mexico killed 11 workers and caused the rig to sink. As a result, oil began leaking into the Gulf creating one of the largest spills in American history. During the next 87 days an estimated 4 million barrels (168 million gallons) were released from the reservoir, of which 3.19 million (134 million gallons) were released into the Gulf of Mexico.
For more than 200 years, or since the industrial revolution began, the concentration of carbon dioxide (CO2) in the atmosphere has increased due to the burning of fossil fuels and land use change (e.g. increased car emissions and deforestation). During this time, the pH of surface ocean waters has fallen by 0.1 pH units. The pH scale, like the Richter scale, is logarithmic, so this change represents approximately a 30 percent increase in acidity.
Ocean water is on the move, affecting your climate, your local ecosystem, and the seafood that you eat. Ocean currents, abiotic features of the environment, are continuous and directed movements of ocean water. These currents are on the ocean’s surface and in its depths, flowing both locally and globally.