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Savatey [412]
3 years ago
15

Which of the following is true of dead zones? a. They are formed when a volcanic eruption covers the soil with ash. b. They are

caused by an increase in the saltiness of the land, making the land infertile. c. They are formed when a specific area lacks nutrients and vitamins. d. They are formed when excess oxygen accumulates in a specific region. e. They are caused by algae blooms that occur when agricultural fertilizers and waste runoff enter natural waterways
Engineering
1 answer:
seropon [69]3 years ago
4 0

Answer: c. They are formed when a specific area lacks nutrients and vitamins.

Explanation: A dead zone is a hypoxic area that lacks nutrients and vitamins.

Hope this helps!  :)

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The pressure difference across hatch of the submarine is 3217.68 kpa.

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Gauge pressure is the pressure above the atmospheric pressure. If we consider gauge pressure for finding pressure differential then no need to consider atmospheric pressure as they will cancel out. According to hydrostatic law, pressure varies in the z direction only.  

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Density of sea water is calculated as follows:

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Here, density of sea water is\rho_{sw}, surface gravity is S.G and density of water is \rho_{w}.

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1.025=\frac{\rho_{sw}}{1000}

\rho_{sw}=1025 kg/m³.

Step2

Difference in pressure is calculated as follows:

\bigtriangleup p=rho_{sw}gh

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\bigtriangleup p=3217680 pa.

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\bigtriangleup p=(3217680pa)(\frac{1kpa}{100pa})

\bigtriangleup p=3217.68 kpa.

Thus, the pressure difference across hatch of the submarine is 3217.68 kpa.

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