The crust beneath the ocean is oceanic crust and usually made of basalt Continental crust consists of rocks such as granite
I was very disappointed in the behavior of some of you on Friday. That was extremely disrespectful of you to run from the classroom when the bell rang. You need to remember that I dismiss you and not the bell. Please take your seat and sit quietly while you wait for class to begin
Mantle The mantle is about 40 km below the surface It consists of a hot, solid rock It can be divided into layers The mantle is about 3000 km thick
The Core Consists of mostly nickel and iron Made of two parts, a liquid outer core and solid inner core Together it is about 3486 km thick
Despite extreme pressure, the outer core is molten surrounding a dense, solid inner core Evidence suggests that the extreme pressure in the inner core will not allow the solid metal to spread and become liquid
Core and Magnetic field Scientists think that movements in Earth’s liquid outer core create Earth’s magnetic field. This magnetism is what attracts a compass’ needle towards north (it aligns with Earth’s magnetic field)
Individually Complete the section 1 assessment on page 131, including the “writing in science” assignment. If you do not complete these in class, they will become your homework and will be due tomorrow.
Make a Chart Types of Heat Transfer Radiation Explanation/definition Conduction Explanation/Definition Convection Explanation/Definition
When you complete the chart Read the sections “Convection Currents”, and “Convection Currents in Earth.” 1. Define Convection Currents 2. Explain how convection currents work, using a real example 3. Create an illustration of a convection current
Bellwork What are the three types of heat transfer and give an example of one that is not in your book!
Continental drift Early 1900s German Scientist Alfred Wegener made a hypothesis: All of the continents were once joined together in a single land mass and have since drifted apart.
The Origin of Continents and Oceans Wegener gathered evidence from different scientific fields to support his ideas about continental drift. He studied land features, fossils, and evidence of climate change
Write a Book! Make your own version of Wegner’s book Use the same title as he did Read pages 138-138 about the evidence he found Create a page for each type of evidence Explain how the evidence supports his hypothesis and include illustrations if appropriate.
The Origin of Continents and Oceans Page 1: Title Page 2: Evidence from land features Page 3: Evidence from fossils Page 4: Evidence from climate Page 5: Conclusion
Hess and Sea-floor spreading Harry Hess in 1960 realized that Wegener was right and the continents were being moved by sea-floor spreading: – The sea floor spreads apart along both sides of a mid-ocean ridge as new crust is added – The ocean floors act like conveyor belts carrying the continents along with them
Editorial You are Harry Hess! (or Harriet Hess) You have just concluded your research about sea-floor spreading Prepare a speech for your science conference in which you will share your findings Include your theory, the evidence that supports if from molten material, magnetic stripes, and drilling samples, and end with a conclusive argument!