Can't download audible books to MP3 player - not happy, Jan. So I sprang the 50 bucks to buy a generic Dick Smith MP3 player because I thought - oh joy - I'd be able to carry my entire audible library around with me on a device that's as small as a matchbox. So I download some audible books. They're there on the device.
A common example of an extrusive igneous rock is basalt. Some extrusive rocks, such as obsidian and pumice, cool so rapidly that they completely lack crystal structure and are considered a volcanic glass. Pumice is just like obsidian except it is tiny shards of glass.
Intrusive/Plutonic - Igneous rock formed when  magma solidifies deep underground (includes granites, the main rock  of the continents).     Extrusive/Volcanic - Ignâ¦eous rock formed when  magma solidifies at the Earth's surface as lava (includes basalts,  the main rock of ocean floors).