1. Monday February 13, 2012• Question of the Day #93 on page 55• Return folders & explain how they were graded• Review and finish foldable• Convection currents animations• Earthquakes & Volcanoes worksheet
2. Green Folders• Complete Table of Contents 1 point• Complete Vocab List (page 4) 1 point• Page 188 questions 1-6 (page 23) 6 points• “Is the Earth preparing to flip?” (page 25) 1 point• Magnetic reversals graphing (page 26) 1 point FOLDER TOTAL 10 POINTS• We also recorded the score for the “Earth’s Layers Online Activity” (page 19). This was a 24 point assignment, so if you misplaced it, that’s a big hole in your grade! Find this and get it to me! There are extra copies up front, or you can follow the link on my website in my post from Tuesday 1/31/12 and answer on a separate sheet of paper.
3. FoldableMake 3 Cuts –DON’T CUT ALL THEWAY ACROSS
4. FoldablePLATETECTONICSTHEORY Foldable – Front ViewCONTINENTALDRIFT THEORYSEA FLOORSPREADINGCONVECTIONCURRENTS
5. Plate Tectonics Theory• Plate – a large slab of solid rock• Tectonic – to build• This theory state that the crust is broken into large pieces (plates) and those plates move atop a hotter molten layer (mantle)
6. FoldablePLATETECTONICSTHEORY Foldable – Front ViewCONTINENTALDRIFT THEORYSEA FLOORSPREADINGCONVECTIONCURRENTS
7. Continental Drift Theory• Developed by Alfred Wegener• Continents had once been joined together in one land mass called Pangaea, but they had since drifted apart• Initially met with hostility and skepticism. Scientists couldn’t believe that whole continents had moved. Wegener was a meteorologist, not a geologist – what could he know about the Earth?
8. FoldablePLATETECTONICSTHEORY Foldable – Front ViewCONTINENTALDRIFT THEORYSEA FLOORSPREADINGCONVECTIONCURRENTS
9. Sea Floor Spreading• Developed by Harry Hess.• Sea floor is created by cooling lava rising through a mid-ocean ridge.• As new lava comes up, older rock sea floor is moved aside.• Youngest rocks nearest the ridge; oldest farthest away.• Magnetic reversals provide evidence.
10. FoldablePLATETECTONICSTHEORY Foldable – Front ViewCONTINENTALDRIFT THEORYSEA FLOORSPREADINGCONVECTIONCURRENTS
11. Convection Currents• Hot, less dense rock is forced to rise upward through cooler, denser rock• As the hot material rises and reaches the top of the mantle, it cools and sinks back down• When it reaches the bottom, it heats back up and rises again, repeating the cycle again and again and again.• This is thought to be the driving force behind plate tectonics.
12. Convection Current Animations• Animation #1• Animation #2
13. Today’s Assignment(Homework if you don’t finish in class!)• Fast Changes to the Earth’s Surface worksheet• Read the information on the front and use it to answer the questions on the back. This will be good background info for our activity tomorrow.• We’ll be interpreting data about earthquakes and volcanoes and trying to find meaningful patterns related to plate boundaries.