To increase the amount of virtual memory go to Control Panel > System > Advanced > Performance > Settings > Advanced > Virtual Memory Change > Custom Size > adjust as needed. 2 times your physical RAM is a good minimum and 3 times your physical memory in MB is good for your maximum.
Mafic lavas are lavas rich in iron and magnesium, while being low in silica. Basalt is the solidified version of mafic lava. Mafic lavas are the most common lava type on earth. Mafic lavas are also the hottest lavas and normally erupt at over 900 degrees Celsius - that's 1,650 degrees Fahrenheit!
The Four Types of Volcanoes. Volcanoes are grouped into cinder cones, composite volcanoes, shield volcanoes and lava domes. Cinder cones are circular or oval cones (left) made up of small fragments of lava from a single vent that have been blown into the air, cooled and fallen around the vent.