Physical Science Question: How can magnetism of rocks provide evidence of continents moving?

Tuesday Connecting the rube to the physics assignment Rube Check (today or tomorrow) Finish zones of earth questions Evidence for continental drift

New option for period 7,5 Create “The day in your life” Rube List 32 actions that happen to you over the course of a single hour period Each action is different from the other actions in some significant way

New option continued Will have to connect your life to the concepts discussed in class just like the other groups and individuals

Question 6 What happens to the temperature and pressure of the rock as you ascend from the center of the Earth to its surface?

Question 7 Compare and Contrast the Lithosphere and Asthenosphere using a Venn diagram

Question 8 Compare and contrast Oceanic crust to Continental Crust using a Venn diagram

Question 9 What does the word evolution mean to you? How can the concept of evolution be applied to both you and the ground you walk on?

Question #10 Which will significantly effect the movement of the Earth? A)Billions of people running to the right at the same time B)Simultaneous explosion of 500 large nuclear bombs around the world C)A major eruption of a large volcano along the strength of the Mt. St. Helens eruption

Hand in your corrected responses to all 10 questions First 5 questions done last Thursday

Homework assignment Use the internet and book to find descriptions of the following concepts: PangaeaDivergent boundary PanthalassaConvergent Boundary Continental driftRift Valley MesosaurusSubduction Zone Mid-Atlantic RidgeOcean Trench MagmaTransform Boundary Sea-floor spreading Paleomagnetism

We have we already discussed Who was the first to propose that the continents moved? What was so important about the extinct lizard Mesosaurus? What is so important about finding rock evidence that it was warm enough for forests in Antarctica or that glaciers existed in hot areas of Africa?

What other evidence is there that the continents have moved?

Age of ocean –vs- continental rocks Physical shape of continents

Paleomagnetism Study of the Earth’s magnetic record over time Hot rocks do not have a set magnetic direction As it cools, the magnetic orientation of is fixed

What is magnetic orientation? Means the direction that the rock makes a compass point as it passes over

Determining the magnetic orientation of ocean rock

What has been discovered… Discovered bands of rock with different magnetic orientation as the ship moves away from ridge Evidence that the orientation reverses every 200,000 to several million years Matched bands with the same magnetic orientation are found on both sides of a ridge

Orientation of rocks around a ridge

Different colors represent rocks of different geologic age

What is the best explanation for the matched bands of rock? New ocean floor is being produced from the ridge Older material material is pushed away from ridge by newer material This in turn moves the continents apart

Iceland on a diverging plate boundary

Who wants to act?

Mid ocean Ridges Are the place of creation of new plate material Boundary between plates As plates are created items on the plates are moved farther away from the ridge Divergent boundary

Where do plates come together? Convergent boundary Subduction zones Most have a lot of volcanic and earthquake activity associated with their interaction

What happens at a subduction zone? Density of material coming together determines what happens Ocean to continental crust Continental to continental

Subduction zone - Japan

Subduction zone –The Himalayas