Pollution is the intoduction of contaminants into the natural environment that causes adverse changes .It can take the form of chemicals substances or energy ,such as noise,heat,or light ,pollutants ,the componenets if pollution ,can be either foreign substances /energies or naturally occuring contaminants.
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< h3 >deforestation < /h3 ><

deforestation ,clearance ,clearcutting or clearing is the removal of a forest stand of trees from land which is then converted to a non-forest use.Deforestation can involve conversion of forest land to farms,ranches,or urban use.
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Environamental pollution is currently the biggest challenge facing the world today.
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RECAP
  • html stands for hyper text markup language.it us a complete code package than allows the user to create webpagesk.
  • the general structure of an htmk document has two sections:head and body.The head section contains the general information about the document and the body section includes text ,graphics,and other html selements that provide control and formality of a page.
  • Tags are the special markers which tellbthe webbrowser how to format and displays the content .
  • some commonly used web browser are internet explorers ,mozilla firefox,netscope navigator,and google chrome.
  • the two types of elements supported by html are containers and empety elements
  • The empty elements are those that include only on tags Examaple,< br >and < hr >
  • the text styles can be changed using < b >,< u >,< i >,< commment >,< sup >,< sub >and < pre > tags
  • the < body > tag defines the largest part of the web page .it has many attributes ,such as bg color,back ground,text etc.
  • we use character entities,like <,>& to display the reserwed characters<,>,and & respectively.
  • a list is the most efficient way of presenting information in a precise manner.
  • The types 9f list that html,provides are:unordered list,ordered list,and definition list.
  • The unordered list is used when the items are not to be displayed in any particular order.
  • The ordered list is used to display the list of items in a specific order.
  • definition lists are used to outfit the multiple terms and their descriptions one after another.
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