natural asphalt Directory References Discover Is It ISIS or ISIL? How Do Deserts Form? Inventors and Inventions of the Industrial Revolution 12 Greek Gods and Goddesses Why Does the New Year Start on January 1? Periods of American Literature Ten Days That Vanished: The Switch to the Gregorian Calendar natural asphalt chemical compound Ask the Chatbot a Question Also known as: brea Learn about this topic in these articles:varieties of asphalt In asphaltNatural asphalt (also called brea), which is believed to be formed during an early stage in the breakdown of organic marine deposits into petroleum, characteristically contains minerals, while residual petroleum asphalt does not. Read More
