measurements can determine the topography of the ocean floor, and have shown that the This steep embankment is called the continental slope and is grooved by The hypsographic curve shows the amount of Earth’s surface at various. Next, a simple hydrostatic balance between continent and ocean gives average that the ocean floor on each plate is produced and moves away Sea level variations, global sedimentation rates and the hypsographic. Oceans and Atmosphere-Hypsography of the Continents and Ocean Floor: Questions of 5. Get to the point CSIR (Council of Scientific & Industrial Research).
|Published (Last):||20 February 2006|
|PDF File Size:||1.16 Mb|
|ePub File Size:||20.58 Mb|
|Price:||Free* [*Free Regsitration Required]|
If the depth of the ocean is measured along a line drawn straight out from a continental shore, the following sequence of bottom features are typically seen.
There was a problem providing the content you requested
Continental shelf- shore-continental slope b. Bibliography Medwin, Herman, and Clarence Clay. There it ends as the slope moderates to a mere degree or two continengs horizontal. This steep embankment is called the continental slope and is grooved by submarine canyons and gullies. Sonar so und na vigation r anginginvented during World War II — measures distances by emitting a short pulse of high-frequency sound and measuring the time until an echo is heard.
In the twentieth century, sounding lines were entirely replaced by sonar systems. This would be the case in crossing the Atlantic Ocean. Divergence of of oceanic and continental plates. View Sample Explanation hypwography View Features. Beyond the rift valley, the depth sequence described above is observed in reverse: For hundreds of years, the only way to measure ocean depth was the sounding line, a weighted rope or wire that was lowered overboard until it touched the ocean floor.
These growing sheets of crust have the effect of forcing the distant continents farther apart, a process called sea-floor spreading.
Principles and Interpretation, 2nd ed. Horizontal dashed lines indicate average height of the continents at meters 2, feet above sea level, and average depth of the oceans at 3, meters 12, feet below sea level. The vertical dashed line marks the division between land and sea at present-day sea level. The fact that Earth’s surface is comprised mostly of flat plates of continental and oceanic crust, with mountains and deep-sea trenches occurring only along their edges where the plates collide, gives the hypsographic curve its characteristic shape.
The oceans begins, of course, at the shore, the irregular boundary where the surface of a continent descends first to sea level and ofean beneath it. What percent of the earth’s surface is “deep” ocean and how deep is “deep” ocean considered?
The hypsography of the ocean floor
Larry Gilman and K. Question Which of the following sequence represents increasing slope? It is composed of fine-grained continental sediments silt and clay cpntinents down the many submarine canyons that notch the continental slope. The disappearance of oceanic crust into subduction zones is occurring primarily along the western, northern, and eastern edges of the Pacific Ocean.
In the case of the Mid-Atlantic rift valley, one sheet flows east and the other west, each moving at about half an inch per year. From this valley, new hhpsography crust is constantly being extruded from Earth’s mantle by processes not yet fully understood.
Many sonar techniques have been developed for bathymetry.
A tornado over Bangladesh with wind speed of and horizontal length scale of. Along the length of a typical subduction zone or deep-sea trench, a sheet of old oceanic crust is forced beneath continental crust.
Bathymetric mapping involves the production of ocean and sea maps based upon bathymetric data see historic map. Continental slope-continental shelf-shore c. This gradual zone, which may be several hundred miles wide, is called the continental rise. Beyond the abyssal plain, which may be several hundred kilometers wide, the ocean floor begins to ascend again with a gentle slope. Continental shelf- shore-continental slope.
Show my email publicly. The Hypsographic Curve The elevation features of the ocean floor—shelves, slopes, rises, plains, ridges, and trenches—are quantitatively summarized by oceanographers, along with the distribution of dry land at different altitudes, in a graph called the hypsographic curve see the figure.
The average width of a continental shelf is 70 kilometers 43 miles. After the war, ships with sonar units attached to their hulls crisscrossed the world’s oceans systematically, measuring depth. Get 1 year subscription: The hypsographic curve shows the amount of Earth’s surface at various elevations and depths.