are lava flows fast moving
Lava channels can develop in both pahoehoe and a'a basalt. Once established, lava channels will often develop lava levees along their lengths. In pahoehoe flows, natural levees will be constructed as the channel periodically overflows, thus allowing the lava to congeal and cool along the banks of the channel. In a'a flows, levee buildup can also occur by the bulldozing effect of the moving lava, which will push a'a blocks onto the lava banks. Although lava channels may initially be restricted to a topographic valley, as levees build up over time, they may eventually rise above the surrounding ground surface. Unfortunately, Royal Gardens was built four miles directly below Pu`u O`o -- a very active and prolific lava producing volcano. Molten lava spewing out of that crater first began destroying sections of the subdivision streets and homes as far back as the mid-eighties. A volcanic dome A) forms from viscous lava B) is basaltic in composition C) characterizes oceanic ridge volcanism D) forms from very extensive flow sheets. Most damage when a volcano like Mt. St. Helens erupts results from A) fast-moving lava flows B) pyroclastic flows and floods in valleys C) extensive lava flows D) blowdown by the blast (shock wave). Fast moving lava flows from Pu’u ‘O’o Vent: A fast moving lava flow has advanced nearly 3 miles (4.4 km) north-northeast from its source at Pu’u ‘O’o Vent over the past week. The flow originated on June 27th, when lava broke out from fissures on the northeast flank of Pu’u ‘O’o Cone. NOTE: Help with movie needed: **** I am working an a serious feature lava flow movie -- The story is nearly formed-- tons of hynotizing molten lava footage, edited and ready to go! -- Hey, if any of you know of a movie producer, or someone willing to finance this movie, please email me. A lava flow: A. can be outrun by most people B. can produce short term climate changes C. poses more threats to property than human life D. makes land immediately unsuitable for farming after the eruption. In its last eruption, the Yellowstone caldera ejected 1,000 cubic kilometers of pyroclastics, making this eruption A) smaller than Mt. Mazama's (Crater Lake) last eruption B) smaller than Mt. Pinatubo's eruption in 1991 C) smaller than Mt. St. Helens's eruption in 1980 D) larger than all of the above. D. Remnants of the now inactive perched lava pond on Pu’u ‘O’o’s north flank – Photo: HVO-USGS. The southernmost lobe followed the path of a cooled perched lava channel from the 2007 flow. Fast moving lava swiftly traced the edge of the old channel, and has traveled nearly 3 miles to the north-northwest over the past week. The fast moving lava flow traces the edge of the 2007 perched lava channel – Photo: HVO-USGS. HVO scientists believe the flow’s rate of advance will probably begin to slow down soon, as it reaches flatter terrain. SIMPLE AND COMPOUND LAVA FLOWS. The single most important factor on the form of a lava flow is probably the effusion rate, or rate of discharge, measured in cubic meters per second. The higher the effusion rate, the greater the distance traveled before cooling lowers the viscosity and impedes flow.
Yes