GEOL 1001 Chapter : Ch 5 Geology
Document Summary
Every few hundred years one of the hills of vulcano spews near the. With this it can run down steep slopes fast, it then can cool to a walking speed. Most flows go a few km long but some registered as much as 600 km long. As time progresses the lavas interior can cool somewhat and only allow the other hot lava to move through a tunnel like way, or lava tube. Basalt flows with warm, pasty surfaces wrinkle into smooth, glassy rope-like ridges, called. If the surface layer freezes, and breaks up into rough sharp angular forms due to continued movement underneath it is called a"a". When lava finally cools, it contracts do to loss of heat and breaks up into polygonal columns, this fracturing is called, columnar jointing. Basaltic flows underwater cool rapidly and don"t travel far, and form a glass encrusted blob or.
