Water cycle wheel pdf

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Run and get a water cycle wheel pdf of water and put it on the table next to you. Take a good long look at the water. When the first fish crawled out of the ocean onto the land, your glass of water was part of that ocean. When the Brontosaurus walked through lakes feeding onĀ  plants, your glass of water was part of those lakes.


The earth has a limited amount of water. Evaporation is when the sun heats up water in rivers or lakes or the ocean and turns it into vapor or steam. Transpiration gives evaporation a bit of a hand in getting the water vapor back up into the air.

Water vapor in the air gets cold and changes back into liquid, forming clouds. You can see the same sort of thing at homeĀ  Pour a glass of cold water on a hot day and watch what happens. That water didn’t somehow leak through the glass! It actually came from the air.

Precipitation occurs when so much water has condensed that the air cannot hold it anymore. When water falls back to earth as precipitation, it may fall back in the oceans, lakes or rivers or it may end up on land. Print these out and use them as posters or coloring pages. This article is about the environment impacts of products.

For the ultimate cost of business decisions, see Life-cycle cost analysis. Designers use this process to help critique their products.

Interpreting the results to help make a more informed decision. The goal of LCA is to compare the full range of environmental effects assignable to products and services by quantifying all inputs and outputs of material flows and assessing how these material flows affect the environment.

This information is used to improve processes, support policy and provide a sound basis for informed decisions. The term life cycle refers to the notion that a fair, holistic assessment requires the assessment of raw-material production, manufacture, distribution, use and disposal including all intervening transportation steps necessary or caused by the product’s existence. There are two main types of LCA. Social LCA is under development as a different approach to life cycle thinking intended to assess social implications or potential impacts.

Social LCA should be considered as an approach that is complementary to environmental LCA. ISO 14000 environmental management standards: in ISO 14040:2006 and 14044:2006.

ISO 14044 replaced earlier versions of ISO 14041 to ISO 14043. GHG product life cycle assessments can also comply with specifications such as PAS 2050 and the GHG Protocol Life Cycle Accounting and Reporting Standard. According to the ISO 14040 and 14044 standards, a Life Cycle Assessment is carried out in four distinct phases as illustrated in the figure shown to the right.

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