EVERYDAY SCIENCE

Detailed explanation-1: -Free oxygen combined with methane and ammonia to form water, carbon dioxide and other gases.

Detailed explanation-2: -Changes in the atmosphere The proportion of ammonia decreased as it reacted with the newly formed oxygen in the atmosphere to form nitrogen and water vapour. The proportion of methane decreased as it reacted with the newly formed oxygen to form carbon dioxide and water.

Detailed explanation-3: -Photosynthetic organisms combine CO2 and water (H2O) to produce carbohydrates (such as sugars) and emit oxygen as a by-product. Places such as forests and areas of the ocean that support photosynthetic microbes, therefore, act as massive carbon “sinks", removing carbon dioxide from the atmosphere via photosynthesis.

Detailed explanation-4: -Methane is the main component of natural gas. Methane enters the atmosphere and eventually combines with oxygen (oxidizes) to form more CO2. Methane converts to CO2 by this simple chemical reaction.