5. Compare the density of the oceanic crust to continental crust. 6. What kind of plate boundary is this? convergent
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1 The youngest rock is in the middle (at ridge) and it gets older on either side as you move away in a symmetrical pattern. 1. How does the age of the seafloor compare on either side of the ridge? A = youngest B C D = oldest 2. List the volcanic islands in order of increasing age. 3. What is a possible age of island B? Anything less than 8 million years old 4. Name a chain of islands that has formed in a similar way. Hawaii Oceanic is denser than continental 5. Compare the density of the oceanic crust to continental crust. 6. What kind of plate boundary is this? convergent 7. Describe the relative motion of the tectonic plates here. Come together 8. What kind of lava will be extruded from the volcanoes that form here? Felsic (coming from the (felsic, mafic, or andesitic) land) 9. Where in the Americas is this happening? West coast USA/ West S.A SSAcoast
2 Southeast contour lines are bending in the opposite direction of stream flow 10. Which way is Hammer Stream flowing? Explain. Mass movement (from gravity) 11. What is the name for this category of erosion? 12. Why is this considered erosion & not weathering? Sediment and rocks are being moved (not broken)
3 13. What controls the speed of the sediment? (referring to settling rates) Size, Density, Shape Diagram A: Old-Age Diagram B: Youtful 14. What are the names for the stages of this streams development? Diagram C: Mature 15. Compare the velocity of the stream in diagram A to Diagram B. The velocity is much lower for A (more meanders) 16. If a glacier were to advance into the valley of Diagram B, how would the Instead of a V-shape it shape of the valley change? would be a U-shape Ig: Solidification of magma Sed: Cementation of fragments of other rocks Meta: Heat and/or pressure is applied to an existing rock 17. What is the method (process) of formation for each type of rock? 18. If they were drawn to actual size, what is the texture of the Each rock? Ig: Coarse Sed: Clastic Meta: Foliated (banding) 19. If they were drawn actual size, is the igneous rock intrusive or extrusive? Explain. Intrusive large (visible) mineral crystals cool slowly 4.6 billion years ago 20. How long ago did the Precambrian Eon begin? 21. How many millions of years ago did the Paleozoic Era begin? ~550 million years ago 22. Approximately how long have humans been on Earth? Less than 1.8 million years
4 23. What event marked the boundary between the Mesozoic and the Cenozoic? 24. List the Periods that make up the Mesozoic from most recent to most ancient. Mass extinction of dinosaurs, ammonoids, etc. Cretaceous = recent Jurassic Triassic = ancient A has rounded features and what appears to be a river valley. B has angular features. 25. What evidence in the diagram suggests that A is a humid region & B is an arid region? No they were originally deposited flat and horizontally and were then folded. 26. Were the rock units formed in this pattern? 27. What kind of tectonic forces could produce a landscape like this? Convergence 28. Were these rock units folded, faulted, or tilted? Folded The gradient of the land is steeper (contour lines are closer together) 29. How do you know copper creek is flowing faster between points N & M, than between points L & K?
5 30. What is the elevation for point A? 10 meters 31. What is the highest possible elevation for the island in the NW corner of 29 meters the map? 32. What is the distance between points D & E? 2.5km 33. Calculate the gradient between points B & C. (50-50m)/2.5km = 0 m/km A 34. Why are the sediments sorted as shown in the diagram? 35. If the size of the sediment at point A is 0.02 centimeters, how fast was the current there? The velocity of the stream decreased, so the biggest particles were dropped first and the smallest particles dropped last. 1 cm/sec Oldest: A 4 (no contact metamorphism on top of 7) List the eight rock units in order from oldest to youngest Youngest: What is line A A called? unconformity 38. What kind of rock would be found at point A? Marble (metamorphism of limestone) 39. If layer #4 was formed during the Ordovician, which trilobite index fossil Cryptolythus might be found within that rock unit?
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