Seabed - Wikipedia
网页The seabed (also known as the seafloor, sea floor, ocean floor, and ocean bottom) is the bottom of the ocean. All floors of the ocean are known as 'seabeds'. The structure of the seabed of the global ocean is governed by plate tectonics. Most of the ocean is very deep, where the seabed is known as the abyssal plain.
Ocean floor features - National Oceanic and Atmospheric Administration
网页2020年5月1日 · Marine life and exploration on the ocean floor. New species are discovered in the ocean each year by marine biologists and other ocean scientists. Many of these newly discovered species live deep on the ocean floor in unique habitats that depend on plate movement, underwater volcanoes, and cold water seeps.
Seafloor Spreading - National Geographic Society
网页2023年11月29日 · Seafloor spreading is a geologic process in which tectonic plates —large slabs of Earth's lithosphere —split apart from each other. Seafloor spreading and other tectonic activity processes are the result of mantle convection. Mantle convection is the slow, churning motion of Earth’s mantle.
海床 - 维基百科，自由的百科全书
网页海床 （英語： Sea floor），也被稱為 海底 或 洋底 （Ocean floor）是指海洋的底部， 海洋板塊 構成的 地殼 表面，它對 陸地 形態的演變及 地質 史有重要影響。 海洋結構. [编辑] 主要的海洋分區. 参见： 海底擴張學說. 在洋中脊上涌的地幔物质形成新的洋底，大约耗用50my从摄氏1000度冷却到平衡态并下沉到最大深度。 最大的洋底是 太平洋板块，大约运动速度10cm/yr。 冷却的大洋地壳容易变质为榴辉岩，比 幔岩 的密度更大。 底棲生物. [编辑] …
Mapping the Seafloor | U.S. Geological Survey - USGS.gov
网页2022年4月27日 · The seafloor has distinct features and characteristics that help us better understand Earth’s current and past conditions, potential resources, and natural hazards. However, less than 10% of the seafloor has been mapped globally.
Seafloor Mapping - NOAA Ocean Exploration
网页2022年7月20日 · Seafloor Mapping. Our global ocean covers over 70% of the Earth’s surface. The marine ecosystem is the largest and most abundant in the world. However, most of the ocean is permanently dark, cold, and incredibly difficult to observe. Only slightly more than 23% of the seafloor has been mapped …
Seafloor spreading | Evidence & Process | Britannica
网页seafloor spreading, theory that oceanic crust forms along submarine mountain zones, known collectively as the mid-ocean ridge system, and spreads out laterally away from them. This idea played a pivotal role in the development of the theory of plate tectonics, which revolutionized geologic thought during the last quarter of the 20th century.
The Seabed: An In-Depth Look At The Ocean Floor
网页The seabed, otherwise known as the ocean floor, seafloor, ocean floor, or ocean bottom, describes the bottom of the ocean. Regardless of the depth, consistency, and geography, all floors of the ocean are known as the seabed.
ocean floor - Encyclopedia Britannica
网页The ocean floor has the same general character as the land areas of the world: mountains, plains, channels, canyons, exposed rocks, and sediment-covered areas. The lack of weathering and erosion in most areas, however, allows geological processes to be seen more clearly on the seafloor than…. Read More. mining.
Introduction to the Ocean Floor | manoa.hawaii.edu…
网页The ocean floor covers more than 70 percent of the planet’s surface. Like dry land, the ocean floor has various features including flat plains, sharp mountains, and rugged canyons (Fig. 7.1). However, the lowest point in the world ocean is …
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