“Geoworld” Plate Tectonics Lab 3 6. Using the magnetic anomaly patterns in the Aragorn Ocean, determine when sea floor spreading started to form the Aragorn Ocean crust (remember, spreading is not actively going on now but it was at one time). Spreading Started __ m.y. ago 7. At the time that active sea-floor spreading was occuring in the Aragorn Ocean, at what rate was new sea-floor being created? (Think: is this related to the full spreading rate or the half spreading rate)? Show your equations and explain where each number came from.
B. Plate Boundaries 1. There are two plate boundaries on the map. You already highlighted one of them in Part 1, A. 1. above. Highlight the other boundary also.2. Give one example of each of the following types of plate boundaries on Geoworld (Note: the boundary between two plates can vary in type from place to place).
3. How many lithospheric plates are there in all?C. Cross-Section Make a schematic cross-section of Geoworld along A-A'. Draw it in the box provided at the bottom of the map on page 9. Show the entire thickness of the lithosphere and part of the asthenosphere. Label the crust, mantle lithosphere and asthenosphere.