EPSC 201 Study Guide - Final Guide: Cyanobacteria, Iron Sulfide, Chromosome
11 Jul 2013
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Epsc201 2004 final exam review section 7&8: explain why ridge mountains form in continental rifts. As the ridges get stretched out, they change their gradient from subtle to steep. There are steep ridges on the edge of the stretched out basin. The basin also gets lled with sediment from erosion of the rifts. There is also block rotation, which occurs when the normal faults are have the same slope, forming a domino wedge. The professor called this block rotation, and simply means that as the zone is extended (it occurs in extensial zones) the dominos will tilt further and further. Hence block rotation: explain three different criteria for establishing relative ages of rocks. Based on cross cutting relationships, we know the vertical crosscut is the youngest. Using fossil records can help with the determination of age. This can help us form a global age. Any rocks with trilobites are about 400 million years old.
