1. There are four eras of Earth’s history they are Precambrian (87.6%)‚ Paleozoic (7.1)%‚ Mesozoic (3.9 %)‚ and Cenozoic (1.4 %) 2. There are four layers and two sub layers. * Inner core is solid metal and made up of nickel and iron * Outer core is made of a liquid molten core of nickel and iron * Mantle is made up of dense and mostly solid silicate rock * Lithosphere is the uppermost layer (100km thick) * Asthenosphere is the layer below the
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particles which slowly rested on the seabed. Over time‚ layer upon layer of these particles piled up on the sea floor and compacted‚ forming limestone. In some areas of Waitomo‚ the limestone is over 200 meters thick. Magma within the earths mantle was heated near the core. This made the magma less dense and so it rose nearer to the earths crust. As it moved along the crust‚ friction caused the plates to move. These convection currents beneath the earths surface forced the Australian plate to collide with
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Plate Tectonics Ever since the beginning on time‚ Humans believed the ground is solid and immobile. But this is not true whatsoever. The Earth is every-changing and continually in motion. The stability of the Earth is not at all what we think it is. Thinking about the rotational axis of the Earth‚ and possibly of what the Earth may become at a certain point in time‚ has a great influence on understanding all aspects of living things‚ either in the past‚ present‚ or future. The study of Plate
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ocean and create islands (ex: Hawaii). The top of this river valley is slit a part and deGruy decides to go between and observe deeper. He observed thousands of active volcanos erupting and lava and magma fillings to create new land (help making of islands and mountains). As the water goes through the magma chamber‚ the heat creates pressure. This makes water super saturated with minerals which are shot up like geysers also known as chimneys because they create black smoke going up about 30 feet and
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Mount St. Helens is a volcano located in southwestern Washington. Which is 50 miles northeast of Portland‚ Oregon‚ and the Cascade Range of the Pacific Northwest. This volcano is a composite volcano. The volcano Mount St. Helens is also known as a strato volcano. It is constructed by alternating layers of lava‚ ash‚ and other volcanic debris. They also tend to erupt explosively and pose considerable danger to nearby life and property. In the year 1980 there was an eruption. Before the time
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in the future. Many things about Ecuador’s future landscape can be told through what has happened in the past. When volcanoes are active they erupt and produce lava (called magma when inside
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Review for Midterm Earth is 4.6 billion years old What do Geologist do Study the structure of mountain ranges Attempt to predict geological hazard Principle of parsimony = Occams Razor (Simpler is better) Deep Time The amount of time of Earth’s existence Universe began=Big Bang Theory Earth’s creation= Nebula hypothesis Geological time Scale Largest units to smallest (EEPE) Eons Eras Periods Epocs Cambrien Explosion Mass amount of fossils found in the Cambrien time period Names
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amphiboles” (Granite‚ 2017). Granite has a granular texture. Granite forms from magma slowly crystalizing below the surface of the Earth. The magma then cools down before reaching the Earth’s surface and forms large crystals. Granite is an igneous
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identified in the eruptive history of Somma-Vesuvius (1). Each was preceded by a long period of stillness‚ which in the case of the 79 A.D. eruption lasted about 700 years. These eruptions were fed by viscous water-rich phonotitic to tephritic phonolitic magmas that appear to have differentiated in shallow crustal conditions. They are believed to have slowly filled a reservoir where differentiation was driven by compositional convection. A minimum depth of about 3 km was inferred for the top of the magmatic
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| * Volcanoes are openings in the Earth’s surface. When they are active they can let ash‚ gas and hot magma escape in sometimes violent and spectacular eruptions. * The word volcano originally comes from the name of the Roman god of fire‚ Vulcan. * Volcanoes are usually located where tectonic plates meet. This is especially true for the Pacific Ring of Fire‚ an area around the Pacific Ocean where over 75% of the volcanoes on Earth are found. * While most volcanoes form near tectonic boundaries
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