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ad-work [718]
3 years ago
12

How has headphones changed over time

Geography
1 answer:
Paul [167]3 years ago
6 0

Answer:

Let's take a look at the modern day headphones we have now. They're airpods. Wirless. It used to be connected to wires. And those earbuds used to be headphones. And those headphones used to be heavy speakers.

Explanation:

How did they evolve with growth in technology? Back in the early 1890s, headphones were single-sided, heavy speakers that people would hold on to an ear to communicate. This later evolved into something known as an 'Electrophone'. It was a system consisting of a stethoscope-shaped headphone connected to a switchboard.

We started using them in the wars to communicate with the troops on the ground and now we use them to stay focused, to disappear and to give ourselves some time away from the stressful world we live in.

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Antidegradation, designated uses, and water quality criteria make up the three parts of water quality standards. The level of water quality required to sustain a certain designated use is represented by water quality criteria.

A probe that can record data at a single moment in time or logged at regular intervals over a long period of time can be used to assess water quality. Water samples can also be taken for laboratory examination. Information on water quality is used by the Department of Water to support decisions regarding the management of water resources. Certain toxins in our water might cause health concerns, such as neurological diseases, reproductive troubles, and gastrointestinal illnesses. People with low immune systems, infants, young children, pregnant women, the elderly, and pregnant women may be particularly susceptible to sickness. A measure of the acceptability of water for a specific application based on chosen physical, chemical, and biological qualities is known as water quality. One of the most crucial indicators of the water quality in streams, rivers, and lakes is dissolved oxygen, or DO. It is an important indicator of water pollution [10]. The greater the water quality, the higher the dissolved oxygen concentration. Oxygen is particularly temperature-sensitive and only mildly soluble in water. Numerous elements, including precipitation, climate, soil type, vegetation, geology, flow conditions, ground water, and human activities, have an impact on water quality. The point sources from businesses and municipalities pose the most risk to the quality of the water. The main causes of water pollution are bacteria, viruses, parasites, insecticides, pharmaceuticals, plastics, feces, radioactive materials, fertilizers, and pesticides. These compounds are frequently invisible contaminants since they do not always alter the colour of the water.

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1 year ago
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Answer:

Average life expectancy in most European countries extends well past the age of retirement.

Explanation:

The European Union, or at least most of its members, tend to have relatively good welfare systems. This is the case because of the strong economies of the countries but also because it helps the population, which in turn tends to have positive effects. Some countries are even targeted for migration just because of their generous welfare system.

This situation is very likely to change though as there is a very big chance that the economies of the European countries will not be able to sustain the welfare systems that they currently have. The main reason for this is that the population is aging. With the population becoming older and older, there are more and more people that rely on the welfare system, creating a disbalance in its functioning. On top of that, life expectancy is high and is gradually increasing, meaning that not just more people will rely on the welfare system but also for a longer period of time.

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1. <span>Sahel
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