Volcanic rocks often have a vesicular texture caused by voids left by volatiles trapped in the molten lava. Pumice is a highly vesicular rock produced in explosive volcanic eruptions.
The Dodge Nitro is available as a sport utility. Inventory prices for the 2011 Nitro range from $6,585 to $16,609. It gets EPA-estimated 18-19 MPG combined.
Starting prices for the Dodge Challenger range from about $27,000 to about $63,000, which is higher than average in our sports car rankings. It's also pricier than its two closest competitors: the Ford Mustang and the Chevrolet Camaro. A base Challenger SXT starts at about $27,000 before adding packages.