Edge of nazca plate oldest near plate boundary with

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edge of Nazca Plate, oldest near plate boundary with SA plate (these are three variations of this type of boundary, depending on the types of interacting crust) Oceanic-oceanic Japan Continental- continental Northern India Mid-Atlantic ridge San Andreas Fault in California Why is there no oceanic crust older than 180 million Years? TA CHECK _____________
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Lab 1: Plate Tectonics 15 Step 3: Go to the chart locations and draw the appropriate symbol for each boundary on this map Map Symbols Convergent pppppp (with saw teeth pointing toward the overriding plate) Divergent Transform TA CHECK _____________
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Lab 1: Plate Tectonics 16 Use this page for notes, drawings, or comments that might help you answer the homework section later.
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Lab 1: Plate Tectonics 17 Homework Activities The rest of this lab may be completed in lab or outside of lab. You may find that working on these questions while the TA is in the room can be a big advantage. Keep in mind that some questions will require computers that are not available in the lab room. Activity 1: Plate Boundaries This activity of the lab is organized by plate boundary type. For each type, first draw the plate boundary, then answer the questions that follow. Be sure to include: • Symbols for earthquakes at different depths (different symbols for deep, medium and shallow if needed) Label important topographic features (such as volcanoes, mountains, trenches, mid-ocean ridges, etc.) Label where the older (O) and younger (Y) sea floor is located only if known Arrows indicating the direction of plate motion If you used any of your own symbols, add them to the symbol key below 1. Oceanic-oceanic convergent boundary questions a. In which plate do earthquakes occur (subducting/overriding/both)? ________________________________ b. What happens to earthquake depths as you move inland in a subduction zone? ______________________ c. Where do volcanoes occur in a subduction zone? Are they right on top of the plate boundary, inland of the plate boundary on the overriding plate, or inland of the boundary on the subducting plate? Circle one. d. Why do volcanoes occur there? Describe in detail. _____________________________________________ ________________________________________________________________________________________ e. What physical property of oceanic lithosphere makes it able to subduct/sink at convergent boundaries? ________________________________________________________________________________________ (Continental-Oceanic) (Oceanic-Oceanic) (Continental-Continental) Symbol Key Y younger ocean crust O older ocean crust * shallow earthquakes deep earthquakes direction of plate motion Y Y O mountain range/ volcano trench * * * I. Convergent Boundaries (Draw the cross sections in the rectangles below) A cross section of one type of convergent boundary has been done for you as an example.
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Lab 1: Plate Tectonics 18 2. Continental-continental convergent boundary questions a. At these boundaries, are earthquakes shallow, deep or both? ____________________________________ b. Are there a lot, a few, or no volcanoes associated with these boundaries? __________________________ II. Divergent Boundaries (Oceanic-Oceanic) (Draw the cross section below; use the same symbols as before) 3. Why is the youngest oceanic crust found near the divergent plate boundaries?__________________________ __________________________________________________________________________________________ 4. What properties of divergent boundaries cause it to form ridges of higher elevation than the rest of the ocean floor? _____________________________________________________________________________________
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