Term
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Definition
| The max size of population that can be supported by a particular environment. At this point death and birth rate are the same.\ |
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Definition
| Where the rate of population growth is increasing rate\ |
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Definition
| Before agriculture was developed human lead nomadic life and finding food and shelter as well as possible. Environment factor had a great effect as limited food made carrying capacity remain stable\ |
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Definition
| Brought with it increase yields permanent settlements and ability to store against bad times\ |
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Term
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Definition
| Show what happened to population of particular countries regarding death and birth rate.\ |
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| Factor contributing to exponential growth |
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Definition
| Improvement in building weapons settlements pattern eliminated predator improved social and housing condition healthcare medicine vaccinations resulting in decline death rate.\ |
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Definition
| Improvement to health and social well being results in more female children reaching reproductive age and having child and less death.\ |
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Term
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Definition
| Scientific study of human population.\ |
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Term
| Factor that affect size of pop |
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Definition
| Birth rate death immigration and emigration. Change in pop size (Br+ir) and (Dr and Er). Different in developing and developed countries. Developing country / developed \ |
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Term
| Demographic transition model |
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Definition
| Shows progress of developing country to developed look at 4 stages stable pop early expanding pop Late expanding pop Stable pop\ |
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Term
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Definition
| Tell us how many dependant there are living in area (young under 15 and elderly over 65). Those working are classed and the economically active. Factors leading to increase food production. Changes in land use. Impact of agricultural chemicals. Selective plant breeding. Genetic engineering.\ |
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Term
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Definition
| A series of changes that occur in the land. Bare rocks to Pioneer community followed by moss then small flowers, grass and woody shrubs. Then woody shrub and tree and final climax community of tree thick layers of soil.\ |
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Term
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Definition
| Clearing of forest for land resulting in the land being unable too regenerate itself\ |
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Term
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Definition
| Two third of earth surface is water only 2.5% of water is not salty and 2/3 of that is ice caps.\ |
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Term
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Definition
| Burning of trees and other vegetation release carbon dioxide whilst at the same time destroying photosynthetic organism which could recycle carbon dioxide.\ |
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Term
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Definition
| Losses of topsoil leaves no material suitable for plant growth is caused by deforestation and extensive cultivate fields vulnerable and wind erosion machinery contribute to.\ |
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Term
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Definition
| Process of over of cultivate and using resource of water for crop and animal. Removing wood for fuel in land around dessert and when it is over grazed it become dessert.\ |
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Term
| Bad agricultural practice |
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Definition
| Land ploughed in vertical down slope more susceptible to erosion rain water runs fast and wash top soil.\ |
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Term
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Definition
| Loss of retentive spongy effect of trees. Rapid rain running off hillside. Erosion of fertilise top soil. Less water vapour return to atmosphere evaporation and transpiration more Co2 from burning forest less photosynthesis for forest\ |
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Term
| Deforestation consequence to absorb it |
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Definition
| River fail to provide regulate water supply humans and crops. Flooding of low lying land which are cultivated and inhabited. Soil fertility of hillside reduce causing water and dams to be blocked by silt. Reduction in rainfall.Extra co2 caused greenhouse effects.\ |
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Term
| Disease as limiting factor |
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Definition
| Poor hygiene safe water and swage resulted in epidemic e.g. black death these are now limited by vaccines and better healthcare\ |
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Term
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Definition
| Through evaporation and transpiration water is absorbed to form clouds and precipitation release of water as rain \ |
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Term
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Definition
| Water absorbed into clouds from land water e.g. lake, river\ |
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Definition
| Water absorb into cloud by the trees.\ |
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Term
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Definition
| Return of water from cloud back to land\ |
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Term
| Good agricultural practice |
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Definition
| Land plough horizontal line onto the contours of slop so they\'e2 are not susceptible to erosion rainwater caught in furrow and moves slowly.\ |
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Term
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Definition
| A food chain shows who eats what in a particular habitat. Fo example: grass seed is eaten by a vole, which is eaten by a barn owl. Th sparrows between each item in the chain always point in the direction of energy flow - in other words, from the food to the feeder. (producer) (consumer) (consumer)\ |
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Term
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Definition
| A number of interconnecting food chains make a food web.\ |
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Term
| \cf0 Effects of chemicals on wildlife |
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Definition
| chemicals are used in Agriculture eg DDT and Pesticide.As they enter a food chain their concentration keep increasing at every level. So the consumer at the top of the pyramid will have highest concentration of DDT.Examples thin egg shells of female bird at the top of the pyramid.\ |
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Term
| Harmful effects of nitrogen deposition |
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Definition
| The consequences of human-caused nitrogen deposition are profound and influence many aspects of the Earth system, including Ecosystems: Nitrogen additions to the soil can lead to changes that favour weeds over native plants,which in turn reduces species diversity and changes ecosystems. Research shows that nitrogen levels are linked with changes in grassland species, from mosses and lichens to grasses and flowers. Precipitation: Nitrogen oxides react with water to form nitric acid, which along with sulphur dioxide is a major component of acid rain. Acid rain can damage and kill aquatic life and vegetation, as well as corrode buildings, bridges, and other structures.Air quality: High concentrations of nitrogen oxides in the lower atmosphere are a precursor to tropospheric ozone which is known to damage living tissues, including human lungs, and decrease plant production. Water quality: Adding large amounts of nitrogen to rivers, lakes, and coastal systems\ |
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Term
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Definition
| a condition that occurs in aquatic ecosystems when excessive nutrient concentrations stimulate blooms of algae that deplete oxygen, killing fish and other organisms and ruining water quality. |
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Term
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Definition
| Decrease in level of Oxygen Reduction in light Poisons |
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