Discuss the composition, stratification and significance of atmosphere.

The atmosphere is a dynamic and essential component of Earth’s system, playing a crucial role in shaping life, weather, and various Earth processes. It consists of a mixture of gases enveloping the planet, held in place by gravity. The study of its composition, structure, and function is fundamental to understanding climatic and environmental phenomena that influence both natural and anthropogenic Earth processes.

Composition of the Atmosphere

The Earth's atmosphere is composed primarily of nitrogen (78.08%) and oxygen (20.95%), making up approximately 99% of dry air by volume. Argon (0.93%), carbon dioxide (about 0.04%), and trace gases like neon, helium, methane, krypton, and hydrogen make up the remainder. Water vapor is also a variable but significant component, ranging from 0 to 4% depending on the location and weather conditions. These gases perform critical roles in various atmospheric and Earth processes.

Nitrogen, being inert, provides stability to the atmosphere and is essential in the nitrogen cycle, influencing soil fertility and plant growth. Oxygen supports respiration in living organisms and plays a role in combustion processes. Carbon dioxide, although present in a small quantity, is vital for photosynthesis and acts as a greenhouse gas, trapping heat and regulating Earth's temperature. Water vapor, _____ ________ ____ _______ ___ ____ _________ _____ _________ _______ ___.
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