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Transcript
Earth’s Landforms What are Earth’s landforms? Lesson Essential Question How was Earth shaped and reshaped over time? Landform shapes of land Major landforms= plains, mountains, hills (came to be through forces of nature) Plate tectonics large slow moving slabs or plates Continental Drift Forces within Earth caused Pangaea to break up into continental plates and drift apart EARTH Major Plates Big Idea What has created physical patterns on Earth’s surface? Plate tectonics theory Earth’s surface is made up of slow moving slabs or plates Continents and ocean floors form the top of these plates=move and carry continents and ocean floors with them Pangaea Scientists believe long ago Earth was one large supercontinent known as Pangaea Pangaea Scientist claim forces within Earth caused Pangaea to break into continental plates and drift apart = continental drift Before and After Your Turn Think-Pair-Share Which theory do you support? Why Share Out! Analyze the Diagram page 21 Which of the present-day continents was at one time joined to the east side of South America? Earth Outer layer= surface=crust 10-25 miles thick Mantle 1800 miles below the surface Hot rock like materials Outer Core 1400 miles thick Iron and nickel in the liquid state Inner Core iron and nickel in the solid state Rocky Mountains extreme heat from core causes mantle to create pressure on crust forcing crust to rise pushing large blocks of rock upward mountains, plateaus Rocky Mountains Oh, Beautiful… Himalayas plates push together edges may crumble and fold creating mountains (most highest) Himalayas Breathtaking! Cascade Mountains 2 plates collide One moves up over the other Homework Take notes Shaping Earth’s Surface pages 23-24 How are volcanoes formed? When 2 of Earth’s plates push against each other, the edge of one slides beneath the other Heat within the mantle melts= magma Volcanoes lava is the name of magma that has escaped onto the surface openings through which lava flows are volcanoes Activating Strategy Write 1 haiku about volcanoes Write 1 haiku about ‘shaping Earth’s surface’ Haiku to twist out of shape (5) people can twist, wrench or bend (7 syllables) very twisty too (5syllables) Homework September 26 Questions 1-4 page 25 in complete sentences