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.
Many deciduous oak leaves turn brilliant fall shades. Oak trees (Quercus spp.) are either evergreen or deciduous, depending on species. Some oaks, such as the evergreen Coast Live Oak (Quercus agrifolia), hardy to U.S. Department of Agriculture plant hardiness zones 9 and 10, do not lose their leaves in fall.