Question

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The seafloor holds promise as a source of many natural resources, including valuable metals. As demand for natural marine resources increases, mining these resources from the seafloor also increases. One concern of seafloor mining is the disruption of the seafloor habitat. Which of the following describes the most likely impact of seafloor mining on the surrounding marine environment?

(A) Alteration in seafloor sediments rich in carbon would cause loss of species and an unbalanced population in marine food webs.

(B) Increased levels of metals in the ocean would result in decrease of marine bivalves due to weakened shells.

(C)Methane gas would pollute the marine environment and cause an overabundance of bacteria that feed on it.

(D) Nonrenewable resources in the marine environment would become depleted and affect the balance of the ecosystem.

Answer 1

The answer would be A. it would not be D because marine life does not concern metals and other resources like that. It would be A because life needs carbon, it already does, but it needs to be well balanced and not disrupted.

Answer 2

Answer: (C)Methane gas would pollute the marine environment and cause an overabundance of bacteria that feed on it.

The deep sea mining is done to obtain the minerals and natural gas from the deep regions of the oceanic floor. The oceanic under vents are the rich source of natural gas. The natural gas contains a hydrocarbon called as methane produced by the bacterial strain called as methanogen. The drilling of the oceanic floor for the excavation of the natural gas which is used as a source of energy generally contaminate the oceanic water with the sea debris and the gas is also mixed and leak out to the external atmosphere. The gas pollutes the marine environment being lesser in density than water floats over the surface of water and depletes the supply of the external oxygen from the atmosphere. The methanogen bacterial will distribute abundantly in ocean.