**Environmental science -**The study of natural processes that occur in the environment and how human can affect them 

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**Mass extinction-** when many types of living thing become extinct at the Same  time 

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**Depletion**-reduction in the number or quantity of something.

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**Agriculture**- the art of cultivating the soil, growing crops and raising livestock. It provides the words food. 

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**Radiation**-the emission of energy as electromagnetic waves or as moving subatomic particles, especially high-energy particles which cause ionization.

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**Pesticides**- a chemical the kills insects and other crop-destroying organisms 

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**Industrial growth**- led to urbanization by creating economic growth and job opportunities that draw people to cities. 

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**Urban development**- improvement of an urban area by building- negative is the non farm ownership of farmland

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**Respiration**-the action of breathing.

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**Ecosystems**- a biological community of interacting organisms and there physical environment 

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**Renewable resources**- a source that is alway available or replaced in a short time 

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**Non renewable resources**- a natural resources that can’t be replace in a short amount of time

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**Point source pollution**- a specific source of pollution that can be identified 

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**Non point source pollution**- a widely spread pollution that is difficult to link to a specific point of origin. 

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**Sustainable use**- the use of a resource in a way that maintains the resource at a certain quality for a certain period of time.

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**Land resources**- all features and presses of land

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**Humus**- dark colored organic material in soil

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**Topsoil**-The crumbly top most layer of soil made up of clay and other minerals and humus

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**Soil erosion-** a natural occurring process that affects all landforms- wearing away of a field's topsoil.

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**Overgrazing**- grazing too much that it starts to damage the grassland

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**Drought**- a lone pierd of low percifatstion

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**Desertification**- making and area dessert like 

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**Land management**- the process of managing the use and development of land resources 

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**Ecology**- biology that deals with relations between organisms and there surroundings

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**Photosynthesis**- the process which plants turn light energy to make food 

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**Warming**-gerund or present participle: warming

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**Temperate forests-**A temperate forest is a forest found between the tropical and boreal regions, located in the temperate zone- 2nd largest biome in the world 

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**Deforestation**- the action of clearing a wide area of trees.

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**Aquatic**- relating to water.

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**Aquaculture**-the rearing of aquatic animals or the cultivation of aquatic plants for food.

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**Smog**-fog or haze combined with smoke and other atmospheric pollutants.

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**Pollutant**-a substance that pollutes something, especially water or the atmosphere.

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**Emissions**-pollutants that are released into the air 

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**Acid rain-** rain or a form of precipitation that is more acidic than normal, caused by the release of molecules of sulfur dioxide and nitrogen 

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**Freshwater resource** - Water resources are natural resources of water that are potentially useful for humans, for example as a source of drinking water supply or irrigation water. 97%

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**Wetlands**- land consisting of marshes or swamps; saturated land 

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**Ozone depletion**- reduction in the concentration of the ozone layer

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**Ultraviolet light-** electromagnetic waves with wavelengths that are shorter than visible light 

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**CFC**-human made gasses containing chlorine and Fluorine they are the main cause of the ozone depletion 

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**Catalyst**- a material that increases the rate of a reading by lowering the activation energy 

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**Cellular respiration-** the presses in switch oxygen and glucose undergo a complex series of chemical reactions inside cells releasing energy 

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**Global warming**- a gradual increase in the overall temperature of the earth thought to be caused by an increase of greenhouse gasses in the atmosphere 

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**Biodiversity**- the variety of life in the world or in a particular habitat 

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Ecosystem diversity- the variety of different habitats, communities and ecological processes.

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**Species diversity-** the number of different species present in an ecosystem and relative abundance of each of those species

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**Genetic Diversity** -refers to the range of different inherited traits within a species.

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**Keystone species**-a species on which other species in an ecosystem largely depend, such that if it were removed the ecosystem would change drastically.

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**Extinction** -the fact or process of a species, family, or other group of animals or plants becoming extinct.

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