Which natural phenomena do you think present the greatest challenges to humans? About 240 millions years ago‚ all the land on the earth’s surface was joined together in one vast supercontinent that extended from pole to pole. But by 18‚000 years ago‚ the earth had been transformed; the continents as we know them today had been created and had moved into their present positions. But the Erath’s surface has not stopped moving and the process continues today. Why does this movement occur? Deep within
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Scientist Ben Kennedy begun a very lengthy quest to solve the mystery of the shrinking pumice. This quest would eventually change the way scientists think about volcanoes-forever. One of the things (out of many) that he and his colleagues found out while on the road was that not only the rock was shrinking‚ the pores that make up the rock were shrinking as well. They think that this was due to the heating of the rock‚ and the molten rock’s surface tension. What the scientist found was how some volcanoes
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Geologic Setting The Wabigoon Subprovince is part of the Superior Province‚ an Archean age craton composed of E-NE trending granite-greenstone and metasedimentary terranes that span from western MN to northern Quebec. In Canada‚ the Neoarchean Wabigoon subprovince hosts numerous precious and base metal deposits‚ including the Sturgeon Lake VMS deposits and Rainy River and Hammond Reef gold deposits. Historically considered moderately to weakly prospective for hosting VMS deposits due to inferred
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How does lava temperature impact viscosity and velocity? The higher the temperature the lower the viscosity which allows it to develop a smooth surface skin‚ but this is quickly broken up by flow of molten lava‚ it creates a rough‚ clinkery surface. The lower the temperature of the magma the higher the viscosity which allows the lava to travel down the slope. In the group the average velocity was 0.91 cm/s . How the “lava” flowed was in a high viscosity and a low velocity because the “lava” was
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Tanzania has many major landforms and sources of water that surround it. Some landforms include Mount Meru which is an active volcano‚ Mount Kilimanjaro which is a dormant volcano‚ and the Usambra and Pare mountain ranges. The Gregory Rift is a major landform because it’s the eastern section of the Great River valley. Ol Doinyo Lengai is another native major landform to Tanzania; it is the only volcano in the world to produce netrocarbonatite lava. Tanzania is bordered by the Indian Ocean and contains
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Undara Lava tubes consist of a lava field remaining from a massive volcanic eruption of Mt Undara which occurred 190‚000 years ago. During the Cenozoic‚ there was wide spread igneous activity in Eastern Australia. Volcanism commenced in the late Cretaceous (approximately 70 Ma) and continued through the Cenozoic. The cenozoic is the current geological era. It began 66 million years ago and continues today. About 23.3 km³ of lava flowed from the Mt Undara volcano at an estimated rate of 1000 m³ a
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The Mid-Atlantic Ridge‚ East Pacific Rise‚ East Africa Rift Valleys‚ Red Sea‚ Gulf of California are examples of what kind of plate boundaries. -divergent Andes Mountains‚ Cascade Mountains‚ Aleutian Islands‚ Mariana Islands‚ Himalaya Mountains‚ and the Alps are examples of what kind of plate boundaries -convergent Is it a faster or slower spreading mid-ocean ridge that produces broader and less rugged segments? -faster When you have Oceanic-Contintental convergance‚ which one
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Analyse the factors that cause differences in the hazards posed by volcanoes around the world (40 marks) Your main factors can be put into two simple categories. Human and physical. From there you can then further explore the factors. In my essay I will mainly focus on viscosity‚ location‚ settlement and perception and explore how the physical and human factors intertwine with each other through one simple idea that physical factors dictate the hazard while human factors exacerbate the hazard. From
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Me and My Volcano Volcanoes exist all around the world. They can be very dangerous or unharmful. Some may seem unharmful because of their appearance‚ but they really are harmful to humans and wildlife. Volcanoes occur when two tectonic plates collide or‚ when there is a hot spot in the crust and constructive forces build a volcano. There are two types of volcanic flows pyroclastic and mud flows. Pyroclastic volcanoes occur when the amount of magma in the chamber collects and the pressure
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Me and My Volcano Volcanoes exist all around the world. There are three types of volcanoes‚ they are shield volcano‚ cinder cone volcano and a composite volcano. A volcano is a place where ash‚ gases‚ and molten material rock from deep underground erupt to the surface. Lava comes out of a vent ‚ then it turns into a lava flow. When external waters‚ such as groundwater ‚ mixes with magma and then it turns into steam. The violence of an eruption depends on the amount of gas that was dissolved
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