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.
Oak groups. Oaks are usually divided into two groups: red-black oak group. and white oak group. Some problems of oaks are restricted to or. are more severe in one group versus the other. It is therefore. important to know to which group an oak belongs. Leaf shape is. the simplest way of telling one from the other. Red-black oak group (top image): Leaves have pointed lobes.