Use information from the Washington Post article "Why We've Been Hugely Underestimating the Overfishing of the Oceans" to determine whether each statement is true or false. a. According to the Food and Agriculture Organization of the United Nations (FAO), worldwide catches peaked in 2001 at 86 million tons.
b. Using catch reconstruction, researchers estimate that the actual peak catch was 50% larger than the reported peak catch.
c, Catch reconstruction shows that, since the peak, catches have been increasing, not decreasing as previously reported.
d. The Sea Around Us Project found several problems with the FAO data, such as the fact that data that were not available were reported as catches of zero fish.

"Why We've Been Hugely Underestimating the Overfishing of the Oceans"

Determining whether each statement is true or false:

a. False

b. True

c. False

d. True

Explanation:

The article "Why We've Been Hugely Underestimating the Overfishing of the Oceans," was published by the Washington Post on January 19, 2016.  It was written by Chelsea Harvey.  It tried to show how the world fish stock had been declining due to overfishing.  This is why it provided a report contrary to the FAO report.  

While the FAO report noted that the peak of worldwide catches was at 86 million tons in 1996, the contrary and independent report, using "catch reconstruction" showed that the peak was at 130 million tons in 1996.  The reconstructed research also showed that worldwide fish catches had suffered declines ever since the 1996 peak, thereby threatening "world food security and marine ecosystems".  The contrary report also suggested that all stakeholders must collaborate so that fish stocks can rebuild naturally.

sound is invisible, but sometimes we can feel it. when a kettle-drum is thumped with a stick that time the tight drum skin moving up and down very quickly for some time and then it pumped sound waves into the air. loudspeakers also work in a similar manner.

components of a speaker:

electromagnet

in order to translate an electrical signal into an audible sound, an electromagnet is used in looudspeakers

  suspension

suspension is used to   center the voice coil in the gap of the magnet and it exerts a restoring force to keep it there. suspension is used to limits the maximum mechanical excursion of the diaphragm and voice coil.

voice coil

voice coil is a coil of wire which is attached to the apex of a loudspeaker cone. it provides the motive force to the cone by the reaction of a magnetic field to the current passing through it.

cone

in a   loudspeaker, a   thin, semi-rigid membrane attached to the voice coil, which moves in a magnetic gap due to which it vibrates   and produced sound. it is known as diaphragm and it can also be called a cone, though not all speaker diaphragms are cone-shaped.

surround

surround is also known as front suspension. surround is used to join the cone to the chassis. together with the suspension it controls the cone excursion, and it is also used to   determine how energy which is   travelling through the cone is absorbed, and how the speaker limits when it reaches the ends of its travel.

dustcap

dustcap is used to protect the voice coil from dust and dirt. it is a part of the cone.

how speaker work

the outer part of the cone is fastened to the outer part of the loudspeaker's circular metal rim. the inner part is fixed to   voice coil that sits just in front of a permanent magnet . when loudspeaker is hooked up to a stereo, electrical signals feed through the speaker cables into the coil. it will convert the coil into an electromagnet magnet . when electricity flows back and forth in the cables, the electromagnet either repels or attract the permanent magnet. this moves the coil back and forth, and it pull and push the loudspeaker cone. like a drum skin vibrating back and forth, the moving cone pumps sounds out into the air.in this way loudspeakers works.

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