Lumber Pressure Treated With Chromated Copper Arsenate. Chromated copper arsenate (CCA) has been used extensively in this country as a wood preservative. CCA is composed of: copper, which acts as a fungicide; arsenate, a form of arsenic, which is an insecticide; and chromium, which binds the ingredients to the wood.
Devilâs Throat at Iguazu Falls in Argentina. Photo by: Luca Galuzzi, Creative Commons. Iguazu Falls, also known as Iguassu or IguaÃ§u Falls, are situated on the border of Argentina and Brazil. They touch the Parana region in Brazil and the Misione region from Argentina. The falls separate the river into upper and lower Iguassu.
Use the scrollbar or swipe to see the complete image. The candidates for president of the United States, particularly on the Republican side, have hotly debated how to handle the roughly 2,000-mile (3,200-kilometer) border between the United States and Mexico. Donald Trump has famously and repeatedly promised to seal the border with a wall if he's elected.