The total number of Seamounts In the ocean basins is estimated to be 500 2000 Ov

Question

The total number of Seamounts In the ocean basins is estimated to be 500 2000 Over 30.000 Over 6 Million No one has tried to estimate this number Rift valleys have been shown to support No life life that depends on mostly the Sun for energy Highly interesting food webs of tube worms, crabs etc that depend on earth's internal heat engine to supply energy Human kind has never explored any R.ft Valley areas Only small bacterial communities. Most of what we know about the deep sea-floor is post 1950"s. Some technologies that are largely responsible for our understanding of the geology of the deep sea-floor are Advanced scuba suites and oxygen recycling equipment Ship board methods such as Echo sounders, swath bathymetry and seismic reflection Ability to track large sea animals that live at depth O. New advanced lighting technology If you were to date oceanic crust you would not find oceanic crust older than around____years old. 5000 200 million 65 million 42 million 200 thousand If you looked at the Earth from space you would notice that most of the surface area is Oceans land Islands Exposed Rift Valley lakes Most of the water on Earth is thought to originate from The core of the Earth Rain from outerspace Volcanic Degassing and Comet Rock Weathering Carbonate Rocks Passive Continental Margins A Lack subduction Zones Have active subduction Zones Are Divergent Boundaries Are just lazy At or adjacent to an Active Margin you may expect A Lack of Earthquakes Abyssal Plain Volcanism Ahvays glaciated regions Continental Margins Are always the same width Can vary dramatically in width Are only associated with active margins Abyssal plains are Extremely Rugged Regions Extremely Flat Regions Exist only in the polar regions No life exists on the Abyssal plains True False New Sea floor Is created at Active Margins Passive Margins Divergent Margins Only at the Poles Hawaii forms a chain of volcanic islands that are thought to be formed by a____often called a hot spot. converging plate boundaries trench seismic ridge failed rift stationary mantle plume

Explanation / Answer

13) Option C

over 30,000

Present estimates assess the number of seamounts from 30,000 to 100,000 .

14) Option C

Many endemic species like tube worms, crabs ,corals ,shrimps are found in the rift valleys which depend on hot springs.

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