A Importância Do Ar Para OS Seres VivOS

The correct answer is "aumenta (…) incêndios florestais." This is because the sentence states that air pollution increases with certain human actions such as burning fossil fuels or forest fires.

The correct answer is that the use of public transportation is preferable to individual transportation because it helps control the emission of polluting gases into the atmosphere. This is because public transportation can carry a larger number of people at once, reducing the number of individual vehicles on the road and therefore decreasing the overall emissions.

The statement "O ar não é compressível" is false because air is compressible. Air can be compressed under high pressure, and this property is utilized in various applications such as in air compressors and pneumatic systems.

The correct answer is that the air we breathe is mostly composed of nitrogen. This is true because nitrogen makes up about 78% of the Earth's atmosphere, while oxygen only makes up about 21%. The remaining 1% is composed of various other gases, including carbon dioxide. Therefore, the statement that the air we breathe is mostly composed of nitrogen is accurate.

The correct answer is that the ozone layer is part of the stratosphere. The ozone layer is a region within the stratosphere that contains a high concentration of ozone molecules. It plays a crucial role in protecting the Earth from harmful ultraviolet radiation from the sun.

Oxigênio é um gás comburente porque é necessário para a combustão. A combustão é uma reação química que envolve a combinação de um combustível com oxigênio, resultando na liberação de energia na forma de calor e luz. Sem a presença de oxigênio, a combustão não pode ocorrer. Portanto, o oxigênio é essencial para a sustentação do fogo e é considerado um gás comburente.

The correct answer is that the concentration of high levels of pollutants in the air is marked with the color red. This means that when the air quality is poor and there are high levels of pollutants present, it will be represented by the color red on the Air Quality Index scale.

The correct answer is "a concentração de gases poluentes presentes no ar." This is because the "O Índice da Qualidade do Ar" (Air Quality Index) measures the concentration of pollutants present in the air. It provides a quantitative assessment of the level of pollutants such as carbon monoxide, sulfur dioxide, nitrogen dioxide, and particulate matter, among others. Monitoring and measuring these pollutants is crucial for assessing air quality and its potential impact on human health and the environment.

CFCs, or chlorofluorocarbons, are known to destroy the ozone layer. When released into the atmosphere, these compounds break down ozone molecules, leading to the depletion of the ozone layer. This destruction of the ozone layer allows harmful ultraviolet (UV) radiation from the sun to reach the Earth's surface, which can have detrimental effects on human health and the environment. Therefore, the correct answer is that CFCs destroy the ozone layer.

O dióxido de carbono turva a água de cal. Isso ocorre porque o dióxido de carbono reage com a água de cal, formando um precipitado branco de carbonato de cálcio. Essa reação é utilizada como um teste para detectar a presença de dióxido de carbono em uma substância.