ENVISCI: Intro To Environmental Science

• The atmosphere is the gaseous envelope surrounding Earth
• The Science of Environment is a Multi-Disciplinary Science
• The Science of Environment Compromises of Various Branch of Studies like Chemistry, Physics, Medical Science, Life Science, Agriculture, Public Health, Sanitary Engineering, etc.
• The Science of Environment is the Science of Physical Phenomena of Environment
• The Science of Environment Studies of the Sources, Reactions, Transport, Effect and Fate of physical a biological species in the air, water, and soil and the effects of the human activities upon these
• Environment is the surrounding external conditions influencing development or growth of people, animal or plants; living or working conditions
• biotic - living organisms
• abiotic - non living organism
• Environment - it is the interaction between biotic and abiotic organisms
• It can be concluded that environment comprises various types of forces such as physical, intellectual, economic, political, cultural, social, moral, and emotional
• Environment is the sum total of external forces, influences and conditions, which affect the life, nature, behavior and the growth, development and maturation of living organism
• Environment - is used to describe ,in the aggregate, all the external forces, influences and conditions, which affect the life, nature, behavior and the growth, development and maturity of living organisms.
• The Scope of Environment: Atmosphere
• Etymology (atmosphere): "atmos" - vapor in air
• Etymology (atmosphere) - "sphere" ball,globe
• The atmosphere implies the protective blanket of gases, surrounding the earth
• Atmosphere sustains life on Earth
• Atmosphere saves it from the hostile environment of outer space
• Atmosphere Absorbs most of the cosmic rays from the outer space and a major portion of electromagnetic radiation from sun
• Atmosphere only transmits ultaviolet and radio waves
• Ultraviolet, visible, near infrared radiation (300 to 2500 nanometers)
• radiowaves (.14 to 40 meters)
• tissue-damaging ultraviolet waves below about 300 nanometers
• Atmosphere compromises 78% nitrogen, 21% oxygen, and other amount of argon, carbon dioxide, helium and neon
• Contaminants in the air include smoke, toxic gasses, dust, ash from volcanoes, and salt
• Troposphere - Reaches 12km from the earth's suface
• Troposphere - The thinnest layer of the atmosphere
• Troposphere - Comprises roughly 80% of the weight of the atmosphere
• Stratosphere - Reaches 50 km from the earth's surface (approx 30 km thick)
• Stratosphere - is where Ozone Layer is located
• Ozone Layer - A protective layer of o3 compounds that prevent ultra violet radiation in directly entering the Earth's surface
• Mesosphere - Extends between 50 km and 70 km from the Earth's surface
• Mesosphere - Coldest layer of the atmosphere
• Thermosphere - Contains only 0.001% gasses in the atmosphere
• Thermosphere - Hottest later of the atmosphere
• Thermosphere - Contains the ionosphere
• ionosphere - is where aurora phenomena occur
• Aurora Phenomena - Polar Light
• Aurora Phenomena - electrically charge particle of sun to the air of Earth such as oxygen reaction
• Scope of Environment - Atmosphere, Hydrosphere, Lithosphere, Biosphere