"Basalt" Essays and Research Papers

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1. What are the major rock groups? -Igneous, sedimentary, metamorphic 2. The Columbia Plateau basalts (floor basalts) issued from fissures, which are now preserved as? -Dikes 3. Remove crystals from an andesitic magma and you will get? -A more felsic residual melt 4. Which of the following types of volcanoes is typically the largest in terms of overall volume? -Shield Volcano 5. What minerals are involved in the continuous part of Bowen’s Reaction Series? -Plagioclase Feldspar ...

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Potassium Argon Dating Research Paper

potassium decay constant is relatively accurate. Paleomagnetism: Relative Dating Paleomagnetism is the study of the Earth’s history of magnetic fields. It can be used to determine the relative age of magnetic rock such as basalt (basalt is iron rich, iron is magnetic, thus basalt is magnetic). The Earth has a naturally occurring magnetic field believed to be generated from the core. The Earth’s inner core is mostly comprised of solid iron while the outer core is made up of 2,000 kilometre thick...

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Igneous Rocks

Intermediate rocks are lower in silica content than felsic rocks and an extrusive felsic rock example is andesite. Mafic rocks have a lower silica rate than intermediate rocks, and they are usually dark colored, and an example of an extrusive mafic rock is basalt. Ultrafamic rocks are not generally extrusive rocks, but Peridotite is an intrusive rock, which is ultrafamic. Intrusive rocks are called plutonic rocks. Intrusive rocks are different than extrusive rocks and are formed underground, by magma,...

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Constructive Plate Boundary

(Eyjafjallajökull in Iceland) and characteristic basalt “pillow lava” in underwater eruptions. In this way, as the plates move further apart new ocean lithosphere is formed at the ridge and the ocean basin gets wider. This process is known as “sea floor spreading” and results in a symmetrical alignment of the rocks of the ocean floor which get older with distance from the ridge crest. Evidence for this process comes from the magnetic properties of the erupted basalt. The Earth’s magnetic field has been shown...

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Module 2

crystallized from a. a felsic magma. b. an intermediate magma. c. a mafic magma. d. an ultramafic magma. 12. Specimen #2 is a. gabbro. b. diorite. c. syenite. d. granite. 13. Specimen #5 is a. andesite. b. basalt. c. pumice. d. obsidian. 14. Specimen #6 is a. andesite. b. basalt. c. pumice. d. obsidian. NO 15. Specimen #7 has a. a pegmatitic texture. b. a phaneritic texture. c. an aphanitic texture. d. a glassy texture. 16. Specimen #7 crystallized from a. a felsic magma. b...

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Divergent Boundaries Essay

boundary 2.1.2 Convergent boundary 2.1.3 Transform boundary 2.2.2 Divergent boundary Divergent boundaries cause oceanic ridges, valleys and lakes. Divergent boundaries can cause volcanic eruptions. Location: Basalt in (Mid-Atlantic Ridge, East-African Rift). Convergent boundary Leads to trenches valleys or coastal and intra-continental mountain ranges being formed convergent boundaries often lead to the forming of volcanoes and can tsunamis, earthquakes, oceanic...

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Giant Causeway Case Study

thousand basalt columns in a manner jutting out of a small = coastline piece on the northern coast of Ireland in the county of Antrim. It is believed they came into existence about 60 million years ago. Currently, Antrim County is made up of rugged countryside nonetheless it is mostly tranquil farmland. 50-60 million years ago it was a volcanic activity hotbed. These volcanic activities meant the area was a portion of the Province of Thulean, an enormous basalt lava plain. This molten basalt lava began...

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History of Rocks

through the cooling of the lava. The main minerals of the hard igneous rocks are feldspar, quartz, pyroxene, and amphiboles, also known as the dark minerals, and mica which is a softer mineral. The two most common types of igneous rocks are basalt and granite. Basalt is a dark, fine grained material of many, many lava flows and magma intrusions and granite is a light, course grained rock that is formed in the deepest parts of the crust and are exposed only after deep erosion or the digging of the crust...

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earths crust

The crust can be thicker than 80 kilometers in some spots, less than one kilometer in others. Underneath it is the mantle, a layer of rock some 2700 kilometers thick that accounts for the bulk of the Earth. The crust is primarily made of granite and basalt while the mantle beneath is made of peridotite. More about all that below. How We Know the Earth Has a Crust Just a century ago, we didn't know the Earth has a crust. Until the 1900s all we knew was that our planet wobbles in relation to the sky...

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dynamic earth

thick, the sediment at its thickest was only 1000ft. ⦁ Ewing reached the ridge not only did the sediment get even thinner but dredges also began collecting volcanic rock. Later seismic data would eventually show that the sea floor was composed of basalt, an extrusive igneous rock, and was only a few miles thick. ⦁ Hess would leave the sounding equipment on that would take measurements of the sea floor.  It was at this time that Dr. Hess discovered features on the floor of the ocean that appeared...

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