What are the Seven Seas? - NOAA's National Ocean Service
2024年6月16日 — The Seven Seas include the Arctic, North Atlantic, South Atlantic, North Pacific, South Pacific, Indian, and Southern oceans. The exact origin of the phrase 'Seven Seas' is uncertain, although there are references in ancient literature that date back thousands of years.
How many oceans are there? - NOAA's National Ocean Service
2024年6月16日 — Historically, there are four named oceans: the Atlantic, Pacific, Indian, and Arctic. However, most countries - including the United States - now recognize the Southern (Antarctic) as the fifth ocean.
Why should we care about the ocean? - NOAA's National Ocean …
Climate regulation: Covering 70 percent of the Earth's surface, the ocean transports heat from the equator to the poles, regulating our climate and weather patterns. Transportation: Seventy-six percent of all U.S. trade involves some form of marine transportation.
What is Ocean Acidification? - NOAA's National Ocean Service
2024年6月16日 — Ocean acidification refers to a reduction in the pH of the ocean over an extended period time, caused primarily by uptake of carbon dioxide (CO2) from the atmosphere.
How much oxygen comes from the ocean? - NOAA's National …
At least half of the oxygen produced on Earth comes from the ocean, mostly from tiny photosynthesizing plankton. But marine life also uses roughly the same amount of oxygen to breathe, for cellular respiration, and in the decomposition process.
A Guide to Plastic in the Ocean - NOAA's National Ocean Service
Plastics are the most common form of marine debris. They can come from a variety of land and ocean-based sources; enter the water in many ways; and impact the ocean and Great Lakes. Once in the water, plastic debris never fully biodegrades.
What's the difference between an ocean and a sea? - NOAA's …
2024年6月16日 — Many people use the terms "ocean" and "sea" interchangeably when speaking about the ocean, but there is a difference between the two terms when speaking of geography (the study of the Earth's surface).
Ocean Facts - NOAA's National Ocean Service
The National Ocean Service (NOS) translates science, tools, and services into action, to address threats to coastal areas such as climate change, population growth, port congestion, and contaminants in the environment, all working towards healthy coasts and healthy economies.
Why is the ocean salty? - NOAA's National Ocean Service
Salt in the ocean comes from two sources: runoff from the land and openings in the seafloor. Rocks on land are the major source of salts dissolved in seawater. Rainwater that falls on land is slightly acidic, so it erodes rocks.
Why do we have an ocean? - NOAA's National Ocean Service
2024年6月16日 — Over vast periods of time, our primitive ocean formed. Water remained a gas until the Earth cooled below 212 degrees Fahrenheit. At this time, about 3.8 billion years ago, the water condensed into rain which filled the basins that we now know as our world ocean.