However, radar sounding by the Magellan probe revealed evidence for comparatively recent volcanic activity at Venus's highest volcano Maat Mons, in the form of ash flows near the summit and on the northern flank.
42.
Colima state Gov . Fernando Moreno Pena said recent explosive activity and other indicators have created a 60 percent chance of an explosive eruption like that of 1913, when the volcano sent out dangerous ash flows.
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About 40 families whose homes were built in ravines near the peak _ where mud and ash flows could bury them _ may have to be relocated, and officials are looking to buy land nearby to offer them new homesites.
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To the south are the Mono Craters and Aeolian Buttes, remnants of the extensive volcanism that began millions of years ago and which bear deposits of hot ash flows from the massive rupturing of the Long Valley Caldera that gave birth to the lake.
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He said rocks of up to two meters ( 6 1 / 2 feet ) wide were being blown from the vents and hot ash flows, which travel at speeds of up to 100 kilometers an hour ( 60 mph ), were cascading down volcano's slopes, he said.
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The leading theory is that the rocks began as volcanic ash that fell out of the sky or moved along the ground in ash flows, and minerals inside them were subsequently altered by ground water, said Ray Arvidson, the rover deputy principal investigator from Washington University in St . Louis, Missouri.
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The Long Valley Caldera in eastern California is also a complex volcano; the San Juan Mountains in southwestern Colorado are formed on a group of Neogene-age caldera complexes, and most of the Mesozoic and Cenozoic rocks of Nevada, Idaho, and eastern California are also caldera complexes and their erupted ash flow tuffs.
48.
Having already spent $ 60 million to shore up the island's infrastructure, the British have pledged $ 20 million more, and promised to produce a five-year plan to build a new capital in the island's northern " safe zone " that would replace Plymouth, which has been destroyed by a series of ash flows.
49.
Also found are outcrops of strongly jointed volcanic glass in Clear Creek Canyon along the I-70 corridor called the Skinner Canyon Ignimbrites a spectacular development and exposures of columnar joints in the rewelded ash flow tuffs here are almost unique in the Colorado Plateau because of the limited exposures of these types of volcanic rocks.
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