PBT Strategy: Review EPA's multimedia agency-wide strategy for addressing PBT chemicals. PBT Action Plans: Review EPA's national action plans for the priority PBT chemicals. Priority PBT Profiles: Find here the list of priority PBT chemicals for which the Agency is developing national action plans.As chemicals are added to this priority list, they can be found here. Each chemical also has a short chemical profile.lthough this particular investigative initiative involving 12 specific PBT Chemicals is no longer active, EPA is actively addressing PBT chemicals across the Agency through various programs and projects.
The last time this area would have been dry land was eight to ten thousand years ago, during the most recent ice ageâand so if Yonaguni really was constructed by humans, it would be one of the oldest structures on Earth, and would drastically change what we think we know of prehistory.
The Ancient Structures at Tiahuanaco. They are arguably the oldest, and most baffling ruins on the face of the Earth. It is hard to imagine how they did not come to be known as one of the wonders of the world like the Great Pyramid. Spectacular in its own right, the Great Pyramid is, yet it pales in comparison to the ruins of Puma Punku in Tiahuanaco, in South America. The ruins of Puma Punku are one of four structures in the ancient city of Tiahuanaco. The other three structures are the Akapana Pyramid, the Kalasasaya Platform, and the Subterranean Temple. Even with modern day technology and information, these structures defy logic, and confound those who seek to solve the mysteries that lie within them. The ruins of Puma Punku are said to be the most fascinating, and most confusing of all. Who built these structures? How were these structures built?