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.
The 2015 Fiat 500 lineup starts at a Manufacturer's Suggested Retail Price (MSRP) right around $17,000 for a hatchback Pop and climbs to just over $32,500 for the California-only 500e electric. However, incentives and tax credits can trim that price substantially. These can total as much as $14,000, according to Fiat.