on April 1, 2022
How did the Llano Uplift form?
GeologyCreation of the Area When the surrounding area of younger sedimentary rocks eroded away, it left behind granite at the heart of the uplift. Along with the rest of the Texas Hill Country, the Llano Uplift also rose in elevation during the Cenozoic when the Balcones Fault shifted, lifting the area to the west. What
on April 1, 2022
What were the impacts of the Montserrat eruption?
GeologyWhat is the environmental impact? Forests and beautiful scenery were destroyed, and the giant beaches that attract many tourists were ruined. Because of the lava erupting from the volcano, over half the island had to be evacuated to a safer part. It caused fires and mudflows, resulting in injuries or even deaths. What were the
on April 1, 2022
Is glass a mineral?
GeologyGlass – can be naturally formed (volcanic glass called obsidian), is a solid, its chemical composition, however, is not always the same, and it does not have a crystalline structure. Thus, glass is not a mineral. Is glass made of minerals? It is made from silica sand, soda ash and limestone and/or dolomite. The oxides
on April 1, 2022
What is a fold in rock that bends upward?
GeologyAnticline. a fold in rock that bends upward into an arch. Compression. What are bends in rocks called? The bending or breaking of rock is called deformation or strain. If rocks tend to break, they are said to be brittle. If a rock breaks, it is said to undergo brittle behavior. If rocks tend to
on April 1, 2022
What was the climate like in the Tertiary Period?
GeologyThe tertiary period climate during the beginning was very warm and moist compared to today’s climate. Much of the Earth was tropical or subtropical. Plant trees grew as far North as Grasslands. The climate began to cool by the middle of the tertiary i.e. during the Oligocene epoch. What was it like during the Tertiary
on April 1, 2022
What are the three most common cements?
GeologyThe three, most common, chemical cements in sedimentary rocks such as sandstone are silica (quartz), calcium carbonate (calcite), and the iron oxides. What are the 3 most common cements? The most common cements are carbonates (especially calcite, aragonite, dolomite, and siderite), silicates (primarily quartz, opal, clay minerals, and zeolites), sulfates (especially gypsum and anhydrite) and
on April 1, 2022
What causes a mudflow?
GeologyMudflows can be caused by unusually heavy rains or a sudden thaw. They consist mainly of mud and water plus fragments of rock and other debris, so they often behave like floods. They can move houses off their foundations or bury a place within minutes because of incredibly strong currents. Where do mudflows commonly happen?
on April 1, 2022
How do you find the porosity of a well log?
GeologyThe most common method of determining porosity is with Well Logs.… ϕsl is the porosity from the sonic log (log measurement) , fraction. Δtsl is value of the acoustic transit time measured by the sonic log, μsec/ft. Δtma is value of the acoustic transit time of the rock matrix measured in the laboratory, μsec/ft. What
on April 1, 2022
What weathering effects granite?
GeologyWhat weathering forms cracks in granite? Blocks are boulders formed through the process of mechanical weathering. Solid rock, like this granitic outcrop on Mount San Jacinto in southern California, fractures into blocks by forces of mechanical weathering. Every day, water seeps into cracks in the granite. Every night the cracks expand as the water freezes.
on April 1, 2022
Is mafic lava explosive?
GeologyIn general, the more felsic the magma the greater the volatile content. So mafic/basaltic volcanoes are fairly quiescent, intermediate/andesitic volcanic eruptions are moderately explosive, and felsic/rhyolitic volcanoes may be extremely explosive. What are the 5 types of volcanic eruptions? Types of eruptions Hydrothermal eruption. An eruption driven by the heat in a hydrothermal systems. …