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.
Extrusive Igneous Rocks â¢Extrusive igneous rocks form when magma makes its way to Earth's surface. The molten rock erupts or flows above the surface as lava, and then cools forming rock. â¢Most extrusive (volcanic) rocks have small crystals. Examples include pumice, obsidian, and basalt.