Main article: Roseanne Conner. Played by Roseanne Barr. Roseanne, in a takeoff of her stand-up comedic and presumed real-life persona, is a bossy, loud, caustic, overweight, and dominant woman. She constantly tries to control the lives of her sister, husband, children, co-workers, and friends.
Where Does Volcanic Activity Occur? Myth: Most of the Earth's igneous rocks are produced at the Ring of Fire.. Fact: 70% of the Earth's surface is ocean floor, which is made of basalt, an igneous rock produced at mid-ocean ridges. The ridges are the most volcanically active features on the planet. Plate boundary volcanism. Volcanic activity occurs at two types of plate boundaries: mid-ocean ridges and subduction zones. At mid-ocean ridges, basaltic eruptions produce new sea-floor crust. These underwater eruptions don't produce big mountainous volcanoes, which is why they are often overlooked as the most volcanically active features on Earth.
A) Review of where volcanism occurs. B) Properties of magma\lava (viscosity!) C) Types of Volcanoes. Reference: Press et al. (2004) Chapters 5 and 6; Grotzinger, et al. (2007) Chapters 2, 4 and 12. A) Review of where volcanism occurs. Volcanism is one of the principle consequences of plate tectonics. As we discussed in earlier lectures, there are 3 primary plate boundaries: 1) Convergent, 2) Divergent, 3) Transform Only the first 2 are sites of pervasive volcanism because this is where cracking occurs (as in the