on April 17, 2022
How far does a volcano erupt?
GeologyHelens or Pinatubo can reach high into the atmosphere. The highest Mt. St. Helens plume on May 18, 1980 reached about 31 km (101,700 feet), and the highest Pinatubo plume got as far as 45 km (147,600 feet). How far does a volcanic eruption reach? When volcanoes erupt, molten lava, poisonous gases, and flying rocks
on April 17, 2022
How do you store mineral collections?
GeologyIt is generally accepted that rocks and minerals are best stored in clean, dustproof surroundings in which conditions of low light and stable, moderate temperatures and relative humidity levels prevail. Ideal conditions have been described as 50 % relative humidity at 15 – 20 °C (Price 1992). How do you store mineral specimens? Mineral specimens
on April 17, 2022
Why is the Blue Lake Blue?
GeologyOnce thought to be bottom less, it measures 72 metres deep. Groundwater has filtered down to this layer and which in turn has become an aquifer for the region. Each year around the end of November, the lake turns from grey into a vibrant turquoise shade of blue. Why is the lake blue? Water molecules
on April 17, 2022
Why are sedimentary rocks found in layers?
GeologySedimentary rocks are layered. Some form when particles of rocks and minerals settle out of water or air. … As the sediments pile up, water is driven out by the weight of the overlying pile, and minerals precipitate around the sediment particles, cementing them into rock. Are sedimentary rocks usually found in layers? Sedimentary rocks
on April 17, 2022
Why was the Northridge earthquake so destructive?
GeologyThe Northridge earthquake produced extremely strong ground shaking, which caused the greatest damage in the United States since the 1906 San Francisco earthquake. The Northridge earthquake was caused by dip slip on a thrust fault—the overriding movement of one crustal block up and over a second crustal block (see p. How much damage did the
on April 17, 2022
What is the most famous fault line?
GeologyThe San Andreas FaultThe San Andreas Fault is the most famous fault in the world. Its notoriety comes partly from the disastrous 1906 San Francisco earthquake, but rather more importantly because it passes through California, a highly-populated state that is frequently in the news. What is the name of the famous fault line? The San
on April 17, 2022
What type of silicate is Augite?
GeologyAugite is a member of the pyroxene group of simple silicates, in which the SiO 4 tetrahedra are linked by sharing two of their four corners to form continuous chains. For this reason they are often referred to as single chain silicates. Is augite a silicate? augite, the most common pyroxene mineral (a silicate of
on April 17, 2022
What are two ways volcanoes form?
GeologyDivergent boundaries (crust moves apart, magma fills in) Convergent boundaries (magma fills when one plate goes beneath another) Hot spots (a large magma plume rises from mantle) How do volcanoes form? On land, volcanoes form when one tectonic plate moves under another. Usually a thin, heavy oceanic plate subducts, or moves under, a thicker continental
on April 17, 2022
What is used to measure magnitude?
GeologyThe Richter scale measures the largest wiggle (amplitude) on the recording, but other magnitude scales measure different parts of the earthquake. The USGS currently reports earthquake magnitudes using the Moment Magnitude scale, though many other magnitudes are calculated for research and comparison purposes. What instrument measures magnitude? Richter scale is used to measure the power(magnitude)
on April 17, 2022
How high is Mt St Helena?
GeologyIs Mt St. Helena a volcano? Although Mount St. Helena is not a volcano, a powerful volcanic eruption took place in its vicinity, in an approximately one-mile radius of the mountain. This all transpired more than 3.4 million years ago, and the results of the volcanics contributed to the formation of Napa Valley’s Petrified