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Transcript
COMPARE & CONTRAST THE EARTH’S LITHOSPHERE with AESTHENOSPHERE 1. EXPLAIN HOW CONVECTION WORKS 2. Where does TEMPERATURE in the EARTH come from? 3. What does DENSITY have to do with EARTH’s inner LAYERS and what are they MADE of? Draw Earth’s layers (crust, mantle, cores) LIST & DESCRIBE FIVE (5) PIECES of EVIDENCE that SUPPORT the theory of CONTINENTAL DRIFT. 1. 2. Draw the 3. most 4. recent 5. one here EXPLAIN WEGENER’s EVIDENCE for HIS theory of CONTINENTAL DRIFT! Explain his theory!!! DRAW WEGENER IN 1912… WEGENER made a lot of INFERENCES about what was happening to our Earth surface. WEGENER made a lot of INFERENCES about what was happening to our Earth surface. WEGENER made a lot of INFERENCES about what was happening to our Earth surface. ALL THAT… PRESSURE KEEPS EARTH CRACKED WITH PIECES called PLATES. We all remember WEGENER! Wegener’s EVIDENCE for his Theory of Continental Drift: Puzzling evidense… Wegener evidence of CONTINENTAL DRIFT! 1. Fossils of the same species were discovered on TWO different CONTINENTS. Wegener evidence of CONTINENTAL DRIFT! 1. Fossils of the SAME SPECIES were discovered on TWO different CONTINENTS. 1. . Fossils of the same species were discovered on TWO different continents. 1. Similar fossils of the same species were discovered on 2 DIFFERENT continents.. Paleontologists (dinoscientists) have connecting fossil records to show how the continents were once connected as _ _ _ _ _ _. Paleontologists (dinoscientists) have been tracking the fossil records to show how the continents were once connected as PANGAEA. Paleontologists (dinoscientists) have been tracking the fossil records to show how the continents were once connected as PANGAEA. 2. Wegener found rock layers the ROCK LAYERS in the exactinsame layered positions two different exact same layeredon positions on two continents. different continents. Appalachian rocks… Scottish highlands! 2. ROCK LAYERS in the exact same layered positions on two different continents. Brazil…. West Africa! 3. Wegener found odd places for fossils…like tropical ferns in icy Greenland, 3. Wegener found odd places for fossils…like snail fossils on top of icy mountains, 3. Wegener found odd places for fossils…like snail fossils on top of icy mountains, 3. Wegener found odd places for fossils… glaciers scratched rocks in South Africa. 3. Wegener found odd places for fossils… glaciers scratched rocks in South Africa… global climate change. But alas, poor Wegener But alas, poor Wegener • Wegener couldn’t show ___ the plates move. But alas, poor Wegener • Wegener couldn’t show HOW the plates move. But alas, poor Wegener • Wegener couldn’t show HOW the plates move. • Back then, we had no GPS (global position satellites) nor did we know much about atomic radiation nor C _ _ V_ C _ _ _ N But alas, poor Wegener • Wegener couldn’t show HOW the plates move. • Back then, we had no GPS (global position satellites) nor did we know much about atomic radiation nor CONVECTION! CONVECTION occurs in the ASTHENOSPHERE. As hot, less dense rock floats to the top…cools… then sinks back down again…& again & again. LITHOSPHERE ASTHENOSPHERE REST OF THE HOT STUFF! So, we have a LOT MORE evidence to support Wegener’s Theory of Continental Drift today! magnetic volcanic rock, seismology exercise, and finally magnetic reversals, (compasses) NEW Continental Drift EVIDENCE: 1. MAGNETIC REVERSAL in our midocean ridges get compasses iron core…nail battery? PLATES that MOVE AWAY form NEW CRUST usually IN THE MID OCEAN RIDGES. • These submarines also showed us evidence of MAGNETIC REVERSALS! Magnetic Reversal - The changing in direction of the Earth’s magnetic poles. - When the Earth’s poles do change direction, the rocks on the seafloor become magnetically charged in the opposite direction. Compare Earth to a Magnet Compare Earth to a Magnet Compare Earth to a Magnet NEW Continental Drift EVIDENCE: 1. MAGNETIC REVERSAL in our midocean ridges. 2. NEW Continental Drift EVIDENCE: 1. MAGNETIC REVERSAL in our midocean ridges. 2. Careful MAPPING & TRACKING the movement of Earth’s PLATES. Geologists have mapped all of the Earth’s plates. Scientists track the movement of our Earth’s plates… over land Scientists track the movement of our Earth’s plates… under sea Subs use SONAR… Sonar --(sound echo-location) to map the ocean floor. NEW Continental Drift EVIDENCE: 1. MAGNETIC REVERSAL in our midocean ridges. 2. Careful MAPPING & TRACKING the movement of Earth’s PLATES. SONAR…undersea Geologists study ROCK core samples to show how and when our rocky lands were once connected. NEW Continental Drift EVIDENCE: 1. MAGNETIC REVERSAL in our midocean ridges. 2. Careful MAPPING & TRACKING the movement of Earth’s PLATES. SONAR…undersea ROCK CORE samples