Introduction:The typical definition of eutrophication is 'decrease in the levels of oxygen in the water bodies due to effects of excessive use of chemical fertilisers.' This statement clearly tells us all about the cause of the problem of eutrophication.
Oak is a common wood, yet many people arenât aware that there are two distinct species â red oak and white oak. Between the two, there are only subtle differences when it comes to durability, hardness, and cost. Color and grain pattern are the distinguishing features that set red oak and white oak apart.
The common name oak may also appear in the names of species in related genera, notably Lithocarpus. The genus is native to the Northern Hemisphere, and includes deciduous and evergreen species extending from cool temperate to tropical latitudes in the Americas, Asia, Europe, and North Africa.North America contains the largest number of oak species, with approximately 90 occurring in the United States.Mexico has 160 species, of which 109 are endemic. The second greatest center of oak diversity is China, which contains approximately 100 species. The Crouch Oak is believed to have originated in the 11th Century and is located in Addlestone, Surrey. 2  It is an important symbol of the town with many local businesses adopting its name. 3  It used to mark the boundary of Windsor Great Park. 4  Legend says that Queen Elizabeth I stopped by it and had a picnic.