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WHAT DO WE DO WHEN THE EARTH DECIDES TO CHANGE… So Much to do…..
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Do Now- Write 5 Lines Describe the following problem through the theme of interaction.
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Information Chapter 2-3 Internal forces - will be due today MIRPL Assignment - coming this week Progress reports entered - missing assignment – do nows, class work, latitude and longitude Is your ID on?
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Current Events: World More bodies from Japanese volcano eruption - no lava flows at this time - more activity to follow Protests in Hong Kong - prodemocracy movement - China cracking down on protests
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Do Now- Write 5 Lines Describe the following problem through the theme of interaction.
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Plate Tectonics
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Richter Scale Way to measure strength of earthquakes - we feel a 2.0 - more severe at 4.5 and above Strongest in Chile, 1960 - measured 9.5 Indonesia, 2004 - 9.1 magnitude - large Tsunami, killed thousands
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Tsunami Caused by earthquakes - occur in the ocean Giant wave of water - can top 100 feet high - speeds up to 450 mph Creates total destruction - Indonesia, 225,000 killed - 1.2 million displaced
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Volcanoes 3 types of volcanoes - Composite, Cone, Shield Occur along plate boundaries Extremely destructive Create new landforms - island formation - land masses, mountains
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T-P-S: Can internal changes on the earth affect human advancement? Explain your answer.
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Weathering Physical and chemical process that occurs over a long period of time Mechanical Weathering - physical forces that break rock into smaller pieces - does not change rock the “stuff” in a rock, only makes it smaller in size, breaks into pieces - ex. Ice forms in cracks of rocks and causes them to break
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Weathering Chemical Weathering - the “stuff” in a rock is changed chemically - creates a new composition - the “stuff”, minerals, react with water or air - ex. Iron in rock rusts from air and water, rock changes and crumbles
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Erosion Occurs after weathering, mechanical process that moves materials - occurs by using wind, water, ice, and gravity - rock materials (sediment) is moved to another location Question: How does “dirt” from Lancaster County end up in the Chesapeake Bay?
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T-P-S: Questions to answer at your table How does water erode the surface? How is ice (glaciers) a powerful form of erosion? Wind as a form of erosion, how? Gravity as a form of erosion, how?
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Water Erosion Rivers and Streams (Type 1) - moves material downstream - stronger currents move more material Abrasion - rock is ground by particles (sediment) - faster water equals more grinding Dissolving - chemical breakdown of material in water
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Water Erosion Erodes both horizontally and vertically - rivers become wider and deeper As the river slows… - particles drop out of the water - Delta formation at the end of a river Beaches - increase and decrease - some lose 3ft per year
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Wind Erosion Similar to erosion by water - wind picks up material and moves it - can be abrasive – think about dirt blowing in the air New land features - sand dunes Loess - sediment deposits - very fertile soil
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Glacial Erosion Erosion by glaciers (ice) As a glacier moves… - picks up material and transports it like a river - pieces left behind or deposited in new locations - glaciers move because of gravity Glaciers cut grooves in rocks - grind rocks - leave behind various other particles and features
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Soil formation Weathering and erosion create soil - moved sediment becomes soil - amount of biological material called Humus Soil Factors - Parent material – stuff the soil is made from - Relief – steep slopes produce less soil - Organisms – plants and critters (worms, bacteria) - Climate – affects soil types, cold v. hot - Time – amount of time to produce soil (long process)
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TOTD In what ways does erosion affect the lives of humans? What are the three types of eroding action by water?
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