Homework+Due+friday+19th+Oct

=**Homework Due 19th Oct**= The following are two hypotheses used to explain plate motion.
 * describe  current hypotheses used to explain how convection currents and subduction drive plate motion **
 * **Idea 1: ** The plates move because of convection currents in the asthenosphere which transfer heat from the lower mantle towards the crust. As the currents move, they drag the plates with them. (shear traction).
 * **Idea 2 **: The higher density of cold rock compared to that of hot rock causes the lithosphere to be dragged by gravity (ridge-push) from the relatively high mid-ocean ridge to the subduction zone by the sinking denser lithosphere (slab-pull)

=**Task**= Gather and analyse information from a variety of secondary sources about the **forces driving plate motion**

Here are some good sites, the handout I gave you and KISS notes are good too. [|Driving forces behind plate motion]- Good simple explaination, recommended [|The Mechanism of Plate Tectonics]-ABC's of plate tectonics [|Plate Tectonics-]Wikipedia  **Focus on collecting the descriptions and explanations of models of plate motion and the evidence given to support the models.**

Once you have collected it, summarise and collate the information to describe and explain each of the models of plate motion.