1 Hepatitis A, B, and C are the most common viral forms of hepatitis and are the primary focus of this report. 2  Hepatitis D and E are less common hepatitis viruses. 3  Hepatitis D is a serious form of hepatitis that can be chronic. 4  It is associated with hepatitis B because the D virus relies on the B virus to replicate.
Hydrology is the study of water. Water is one of our most important natural resources. Without it, there would be no life on earth. The supply of water available for our use is limited by nature. Although there is plenty of water on earth, it is not always in the right place, at the right time and of the right quality.
Water is one of the most important natural resources and although plentiful, is not always in the right place at the right time or of the right quality. An overall aim of hydrologists is to apply scientific knowledge and mathematical principles to mitigate water-related problems in society and environmental protection.