Environmental Chemistry Basics - Understanding Our Planet's Reactions

Earth's atmosphere is divided into several distinct layers, each with unique properties.The atmosphere is primarily composed of nitrogen and oxygen, with small amounts of other gases.The greenhouse effect occurs when solar radiation enters the atmosphere and is trapped by greenhouse gases.Ozone formation occurs when ultraviolet radiation splits oxygen molecules, allowing atomic oxygen to combine with molecular oxygen.Water's unique properties come from its molecular structure. Each water molecule has two hydrogen atoms bonded to one oxygen atom.The molecule is polar, with a slightly negative charge on oxygen and slightly positive charges on hydrogen atoms.The pH scale measures how acidic or basic a solution is, ranging from zero to fourteen.Dissolved oxygen is crucial for aquatic life. Its solubility decreases as temperature increases.Water hardness is determined by the concentration of calcium and magnesium ions.The nitrogen cycle in aquatic systems involves several key processes: fixation, nitrification, and denitrification.Various pollutants can affect water chemistry, including heavy metals, excess nutrients, and chemical contaminants.Soil is a complex system made up of distinct layers, each with unique chemical properties.The composition of soil includes minerals, water, air, and organic matter in varying proportions.Organic matter decomposition is a crucial process in soil, where microorganisms break down dead plant material.Bacteria and other decomposers gradually break down the organic matter, releasing essential nutrients.The carbon cycle shows how carbon moves between the atmosphere, plants, and soil through processes like photosynthesis and decomposition.Soil pH greatly affects nutrient availability for plants. Most nutrients are most available in slightly acidic to neutral conditions.