Gallery of Volcanic Rocks. Photo (c) Andrew Alden, licensed to About.com (fair use policy) Igneous rocks -- those which originate from magma -- fall into two categories: Extrusive and intrusive. Extrusive rocks erupt from volcanoes or seafloor fissures, or they freeze at shallow depths. This means that they cool relatively quickly and under low pressures, therefore they are typically fine grained and gassy.
on average it takes the human body approximately two to three hours to excrete a liter of water through the bladder this is dependent on several factors including the absorption of water the components in the water if dehydration is present the time of day and the general health of the person continue reading
When your bladder stretches beyond a certain point, nerves in the bladder wall send a message to your brain telling it that your bladder is getting full and needs to be emptied. Taking a leak. Urine leaves the body by flowing out of the bladder down a tube called the urethra. The junction between the bladder and urethra is opened and closed by a muscle known as a sphincter. When you decide you need to urinate your brain tells this sphincter to relax, opening the bladder-urethra junction.