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.
The three different types of lava differ in composition and flow rate. Rhyolitic lava is the slowest moving type of lava, since it has a high viscosity due to a high silica concentration. Basaltic lava is the fastest moving lava because of its low viscosity resulting from a low silica content.
Lava is molten rock that flows out of volcanoes. Depending on its composition, lava can be categorized as basaltic, andesitic, or rhyolitic. The different types of lava move in different ways including pahoehoe, A'a, sheet, and block flows. Lava cools and becomes igneous rocks.