Contact dermatitis is one of the most common causes of rashes. Contact rashes occur when the skin comes into direct contact with a foreign substance that causes an adverse reaction, leading to a rash. The resulting rash may be itchy, red, or inflamed. Possible causes of contact dermatitis include:
Tear it down Build it up. Destructive Processes are when things happen to the earth that destroy or break down part of it. One example of a destructive process is a river wearing away the rocks and dirt to form a canyon. In the story, an example of a destructive process was the erosion that carried the dirt and the minerals from rocks down into the cave. Weathering is the process that breaks rocks down into pieces called sediment.
Feedbacks are also possible between rates of erosion and the amount of eroded sediment that is already carried by, for example, a river or glacier. While erosion is a natural process, human activities have increased by 10-40 times the rate at which erosion is occurring globally.Excessive (or accelerated) erosion causes both on-site and off-site problems.On-site impacts include decreases in agricultural productivity and (on natural landscapes) ecological collapse, both because of loss of the nutrient-rich upper soil layers. In some cases, the eventual end result is desertification.ind erosion is much more severe in arid areas and during times of drought. For example, in the Great Plains, it is estimated that soil loss due to wind erosion can be as much as 6100 times greater in drought years than in wet years.