Yellowstone National Park is the most famous and the first U.S. national park. It' s located on the territory of three states: Wyoming, Idaho and Montana. Yellowstone occupies the territory of 3.470 square miles (nearly 9,900 km2) and is mostly located in northwestern part of Wyoming. Yellowst...

In the last 10 years, the phenomenon known as acid rain has become recognized both in the United States and Europe as a major environmental danger. Acid rain has brought devastation to thousands of lakes and streams in the U.S. and Canada such as the Colorado Rockies. Some aquatic systems have becom...

The extinction of the DinosaursThe first question that must be posed when trying to crack the mystery of the mass extinction is to ask, throughout history were there any other occurences of this magnitude? The answer is a resounding yes. Altogether over time there has been about eight mass extinctio...