Continental Drift? -Distribution of: -Mtn. Belts/ Rock types/ Structures Ex: Appalachian Mountains one large continuous mtn. belt US->Canada-> N. Europe -Tillites: sedimentary material dumped by a glacier turned into a rock Dinosaurs: - Mesosaurs (similar)/ Mammals (different) -Glossopteris flora (similar) Glaciation: -Can move at a rate up to 6 ft. a yr. -Striations- pebbles in bottom of glaciers scraping/polishing/marking rocks the pass How did Wegner propose the continents
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chemical and structural adjustments in solid rocks to physical and chemical conditions which have been imposed due to changes in pressure and temperature or both. Metamorphism occurs below the surface zones of weathering and cementation. Conditions of metamorphism differ from the conditions under which the rocks in question were originally formed. Metamorphism produced as a result of the progressive increase in temperature and pressure‚ i.e. by burial of a rock within the earth‚ is termed prograde metamorphism
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we’ll make sure we know what these terms mean. Igneous and metamorphic rocks: igneous – rocks that have formed from the cooling of magma. Metamorphic rocks are rocks that have been altered. Amphibole etc. These are types of minerals that are part of the recipe of igneous rocks. Plutonic: cooled beneath the earth surface Felsic: more feldspar mineral and more silica Mafic – more magnesium and iron rich minerals. Peridotite – the rock that forms in the mantle – lots of minerals olivine
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the Lab Exercise‚ Step 2. Record your answer to Lab Exercise‚ Step 2‚ Question 11. How long ago was the igneous rock in rock unit B formed? A. 352 mya B. 380 mya C. 704 mya D. 1408 mya Answer Key: A Question 2 of 31 3.0/ 3.0 Points Record your answer to Lab Exercise‚ Step 2‚ Question 12. How long ago was the igneous rock in rock unit C formed? A. 70.4 mya B. 140.8 mya C. 352 mya D. 704 mya
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Well‚ Earth hasn’t been moving vigorously but it is changing at a steady rate. New geological features‚ rock formations‚ and locations of plates all rise and demolish some in a lifetime and others over a span of millions of years. Earth is dynamic; it constantly progresses and doesn’t rest. Through the churns and molds‚ the twists and turns‚ Earth is active because of plate tectonics and the rock cycle. The ideas and theories that make up plate tectonics have shown Earth’s dynamism. The position
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grassland like a rock protector. It was named our first national monument by President Theodore Roosevelt in 1906. This landscape is surrounded by sedimentary rocks‚ which are rocks that are formed from by the deposition of materials at the Earth’s surface. The rock layer that is visible in the Devil’s Towner is called the Spearfish Formation. It is a reddish color because of the dark red sandstone and the maroon siltstone. The oxidation of iron in this causes the redness. These rocks were the oldest
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A-CN-K (Al2O3- (CaO*+Na2O)-K2O) diagram A–CN–K ternary plot is useful tool to evaluate weathering trends in the source rock and to estimate K-metasomatism [Nesbitt and Young (1982‚ 1984); Fedo et al.‚ 1995]. The ideal weathering lines are parallel to A-CN boundary because the removal rates of Na and Ca from plagioclase are greater than the removal rate of K from k-feldspars. On the A–CN–K ternary plot (Fig.6.16) the samples are plotted more or less close to A - K boundary indicating that removal
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old having been created in 4004 b.c Catastrophists(17-18cen.)-believed that earth landscape had been developed primarily by great catastrophes. John Wesley Powell(1869)- He realized that the evidence for an ancient earth is concealed in its rocks. Geologists-who concern w/ the studied the earth history ‚they learned that earth is much older than anyone and its surface and interior have been changed over and over again. birth of modern geology: Uniformitarianism-It simply state that the physical
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action is the force of moving water on the land. Fast flowing water forces out looses rock and soil from the river bed and bank. Soft rock is eroded faster than hard rock (differential erosion) and overtime the bank will collapse. Abrasion is the wearing away of the river bed by its load. Stones carried by the river smooth the river channel deepening & widening it. Solution occurs when the river dissolves the soft rock over which it flows. The erosion processes mentioned above to form waterfalls
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and Tin B. Lead and Iron C. Carbon and Zinc D. Copper and Tin 5. What acid is found in Vinegar? A. Lactic acid B. Hydrochloric acid C. Ethanoic acid D. Propanoic acid 6. Igneous rocks are also called as A. Fire Rock B. Ice rock C. Coal D. Lime stone 7. The process by which rocks break up to form fragments is called A. Eruption B. Weathering C. Surface run off D. Erosion 8. The word fossil was first used by which scientist A. Nicolaus Steno B. Georgius Agricola
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