1Atmosphere: The gaseous envelope surrounding the earth.
2Anthropogenic:: It is related to the study of the origin and development of human beings.
3Afforestation:: Planting of trees in an area to provide a forest cover.
4Antibiotics:: It is a chemical substance derivable from a mold or bacterium that can kill microorganisms and cure bacterial infections.
5Acid Rain: Rainwater water-containing of acids (nitric, hydrochloric and sulfuric acid) from polluted air is known as acid rain. It damages lakes, forests and marble sculptures.
6Biodiversity:: It refers to the variability among living organisms from all sources, including terrestrial, marine, and other aquatic ecosystems and the ecological complexes of which they are part; this includes diversity within species, between species, and of ecosystems.
7Biogas:: Gas (energy resource) originated from animal dung. It is useful fuel in rural areas.
8Biotic Component: Living component (i.e., plants, animals, and microbes) in an ecosystem.
9Carbon Cycle: Natural cycle based on the exchange of carbon-dioxide among Atmosphere, Biosphere, and Ocean.
10Carcinogen:: Chemicals promoting cancer e.g., benzo-α-pyrene, arsenic, DDT etc.
11Chlorofluorocarbons (CFC):: Used as a solvent, refrigerant, fire retardant etc. Responsible for ozone hole and greenhouse effect.
12Compost:: A nutrient-rich soil produced by the decomposition of organic matter under aerobic conditions.
13Decibel:: Unit for measurement of an intensity of noise.
14Decomposer:: The organisms depend on dead remains of producer’s aril consumer for their food.
15Biodegradable Pollutants: Those pollutants which can be broken down into simpler, harmless, substances in nature in due course of time.
16Deforestation:: Destruction of forest cover. Desertification: The process leading to the desert formation. Detritus: Dead organic matter mainly of fallen leaves as life litter in the forest.
17DDT: Pesticide useful in agriculture and eradication of malaria.
18Ecology:: Study of interactions of living organisms with their biotic and abiotic environments
19Ecosystem:: A biological community and its physical environment exchanging matter and energy.
20Environment:: Something that environs i.e., encircles all our surroundings—the natural world in which we live — the living and non-living objects around us in our day-to-day living.
21Environmental Studies: The studies of the quality of the environment and all aspects of the human environment, their degradation etc. comprise environmental studies.
22Eutrophication: Over nourishment of water bodies due to excessive nitrates and phosphates received through runoff— it is harmful to the water bodies.
23EX-situ Conservation: Conservation of endangered species away from their natural habitat.
24Earthquake:: The shaking and trembling of the earth due to movement inside the lithosphere that could be tectonic or volcanic.
25Energy:: Ability to do work. Environment The physical, chemical and biotic conditions surrounding an organism
26Fauna:: Species content of animals present in an area. Fertilizers: The inorganic materials which can supply plant nutrients in available form.
27Flora:: A species content of plants present in an area. Flood: Submerges of the vast area of land with water.
28Food Chain: Method of transferring of food elements among environment, producers, consumers, and decomposer. Fodder: Green feed of cattle.
29Forest:: Plant community predominantly of trees, often with an extensive undergrowth of shade tolerant shrubs and herbs usually with a closed company.
30Gasohol:: Mixture of gasoline and alcohol is known as gasohol, used as a fuel in Brazil for running cars and buses.
31GNP (Gross National Product): An index of a country’s economic status based on consumerism i.e., commodities purchased per year, consumer durables and financial status of the consumer.
32Greenhouse Effect (Global Warming):: Rise in temperature of the earth’s surface due to the increase in the levels of greenhouse gases viz., carbon dioxide, methane etc. The latter trap heat from the earth’s surface and returns it thereby raising the earth’s surface temperature. This phenomenon is similar to trapping of heat in a glass-covered greenhouse (used for growth of vegetables and flowers during winter) and hence called greenhouse effect.
33Magma:: Molten rock below the earth’s surface.
34Natural Gas: Underground deposits of gases containing mainly methane and small amounts of propane and butane. It is a cleaner fuel than fossil fuel as it produces less carbon dioxide on burning.
35Nitrogen Cycle: Continuous exchange of nitrogen within the ecosystem: air-soil-water.