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acres active Alaska amount ancient avalanche basin beneath buildings burning California called caused cent century channel cities coast crater crops crust crystals cubic damage dams debris deep desert destroyed destructive disaster drought earth earthquake energy eruption explosion fall fault feet high flood plains forest fires fresh water gases geologists glacier goats ground water Hawaii heat heavy inches island Japan killed Krakatoa lakes land landslides layer magma magnitude mass material melt million moisture Mount Pelee mountain move mudflow North occur ocean Pacific Pacific Ocean plants pressure quake rain rainfall rats recorded regions reported reservoirs rise river rock San Andreas Fault scientists sea waves seismic seismic waves seismograph seismologists slide slopes snow soil sometimes speed square miles streams temperature tons trees tsunami U.S. Forest Service U.S. Geological Survey United valley vapor vegetation volcano warning weather wind zone