Tar is produced through the destructive distillation of organic materials such as coal, wood, or peat. During this process, the organic material is heated in the absence of air, causing it to break down into various components, including tar. The tar is then collected and can be further refined for various industrial applications, such as in road construction or as a component in roofing materials. **

Asphalt itself does not burn, as it is a mixture of aggregates and bitumen. However, if asphalt is mixed with tar, which is a flammable substance, it can burn. Tar is often used as a binder in asphalt mixtures, and if exposed to high enough temperatures, it can ignite and burn. It is important to handle and store asphalt and tar mixtures carefully to prevent any potential fire hazards. **

To repair tar, you can start by cleaning the damaged area with a mild detergent and water to remove any dirt or debris. Once the area is clean and dry, you can use a tar patching compound to fill in any cracks or holes. Apply the patching compound evenly and smooth it out with a trowel or putty knife. Allow the patch to dry completely before applying a sealant to protect the repaired area from further damage. **

In tar, the concentration of carbon dioxide (CO2) has risen due to the burning of fossil fuels and other industrial processes. This increase in CO2 levels contributes to the greenhouse effect, leading to global warming and climate change. Additionally, the levels of other pollutants such as sulfur dioxide and nitrogen oxides have also risen in tar, leading to air and water pollution. These pollutants can have detrimental effects on human health and the environment. **

Road tar, also known as bitumen, is produced through a process called fractional distillation. This process involves heating crude oil in a distillation tower, where different hydrocarbons are separated based on their boiling points. Bitumen is the heaviest and thickest fraction of the crude oil, and it is collected at the bottom of the distillation tower. It is then further processed to remove impurities and achieve the desired consistency for use in road construction. The final product is a thick, sticky substance that is used to bind aggregate materials together to create asphalt for roads. **

Intelligent typically refers to someone who has a high level of cognitive ability and can grasp complex concepts easily. Clever usually refers to someone who is quick-witted, inventive, or resourceful in solving problems or coming up with creative solutions. Smart is a more general term that can encompass both intelligence and cleverness, but it often implies practical knowledge, good judgment, and the ability to apply information effectively in various situations. **

Clever typically refers to quick thinking and problem-solving ability, often in a creative or original way. Smart generally refers to having a good understanding of a wide range of topics and being able to apply knowledge effectively. Intelligent usually refers to having a high level of cognitive ability, including the capacity for abstract thinking and reasoning. While all three terms relate to mental acuity, they emphasize different aspects of intellectual capability. **

The difference between smart, clever, and intelligent lies in their nuances. "Smart" generally refers to someone who is quick-witted and has good judgment. "Clever" typically describes someone who is skilled at solving problems in a creative or inventive way. "Intelligent" usually refers to someone who has a high level of cognitive ability and is able to understand complex concepts. While these words are often used interchangeably, they each carry their own subtle distinctions in meaning. **