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.
Add it all up and Insure.com found that 2015's most-expensive model to insure is the Nissan GT-R Nismo, a premium version of the brandâs flagship sports car, at an average $3,574 per year. That's more than twice the $1,555 average for the 1,500-plus models that Insure.com studied.