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  1. 2 days ago · Greenhouse gas (GHG) emissions from human activities intensify the greenhouse effect. This contributes to climate change . Carbon dioxide (CO 2 ), from burning fossil fuels such as coal , oil , and natural gas , is one of the most important factors in causing climate change.

  2. 1 day ago · 1852: Robert Bunsen is the first to use a chemical vapor deposition technique. 1852: Elisha Otis invents the safety brake elevator. 1852: Henri Giffard becomes the first person to make a manned, controlled and powered flight using a dirigible. 1853: François Coignet invents reinforced concrete.

  3. 3 days ago · Although the thermosphere has a high proportion of molecules with high energy, it would not feel hot to a human in direct contact, because its density is too low to conduct a significant amount of energy to or from the skin. This layer is completely cloudless and free of water vapor.

  4. 4 days ago · Lead poisoning, also known as plumbism and saturnism, is a type of metal poisoning caused by lead in the body. [2] . Symptoms may include abdominal pain, constipation, headaches, irritability, memory problems, infertility, and tingling in the hands and feet. [1] .

  5. 4 days ago · One of the primary pathways for the exchange of carbon dioxide (CO2) takes place between the atmosphere and the oceans; there a fraction of the CO2 combines with water, forming carbonic acid (H2CO3) that subsequently loses hydrogen ions (H+) to form bicarbonate (HCO3−) and carbonate (CO32−) ions.

  6. 4 days ago · Heart, organ that serves as a pump to circulate the blood. It may be as simple as a straight tube, as in spiders and annelid worms, or as complex as the four-chambered double pump that is the center of the circulatory system in humans, other mammals, and birds. Learn more about the heart in this article.

  7. 2 days ago · The meaning of VAPOR is diffused matter (such as smoke or fog) suspended floating in the air and impairing its transparency. How to use vapor in a sentence.