Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
CHAPTER 12 VOLCANOES SECTION 1 VOLCANOES AND EARTH’S PLATES KILAUEA IS WORLD’S MOST ACTIVE VOLCANO ICELAND IS FAMOUS FOR ACTIVE VOLCANOES. EFFECTS OF ERRUPTIONS AFFECT LIVES AND PROPERTY ASH CAN BLOCK ROADS, COLLAPSE BUILDINGS AND CAUSE LUNG DISEASE SOME VOLCANIC DEBRIS CAN MAKE A PYROCLASTIC FLOW, BURNING EVERYTHING IN ITS PATH HUMAN AND ENVIRONMENTAL IMPACTS SULFURIC ACID MIXES WITH WATER VAPOR AND FORMS ACID RAIN, WHICH CAN KILL VEGETATION AND POLLUTE LAKES AND STREAMS HOW DO VOLCANOES FORM HEAT AND PRESSURE CAUSE ROCKS TO MELT LESS DENSE MAGMA IS FORCED TO SURFACE AFTER THOUSANDS OR MILLIONS OF YEARS, LAVA REACHES SURFACE AND OOZES OUT OF VENTS, MAKING CONE SHAPED MTN. WHERE DO VOLCANOES OCCUR? DIVERGENT BOUNDARIES ICELAND IS ON TOP OF THE MID-ATLANTIC RIDGE PLATES SEPARATE FORMING VOLCANOES FROM SEAFLOOR SPREADING CONVERGENT BOUNDARIES PLATES COLLIDE FORMING SUBDUCTION ZONE PLATE MELTS, MAGMA MIXES WITH STEAM, GETS PRESSURIZE AND EXPLODES VIOLENTLY HOT SPOTS VOLCANIC ISLANDS THAT FORM IN MIDDLE OF PLATE MANTLE AND CRUST ARE VERY HOT, MAGMA FLOWS TO SURFACE FORMING HOT SPOT CREATES A CHAIN OF VOLCANOES THE HAWAIIAN ISLANDS ISLANDS ARE BEING MOVED WITH PLATE CREATING NEW VOLCANO WHERE PREVIOUS ONE WAS THESE ISLANDS FORMED OVER PAST 5 MILLION YEARS