I ONLY NEED ONE OF THE ANSWERS 4) What is an unconformity? Where can you find one in the Grand Canyon? What types of rocks contact at the “Great Unconformity,” and about how old is each type of rock? What does the missing time between the two rock formations mostly likely represent? Explain in 3-5 sentences (5 points)

5) What type of environment do sedimentary rocks form in? Where do metamorphic rocks form? Keep in mind the rocks at the Great Unconformity when answering. Explain in 2-4 sentences (4 points)

6) Where are fossils from the “Cambrian Explosion” found in the Grand Canyon? What type of environment did the organisms live in and how do we know? Describe what these creatures may have looked like. Explain in 2-4 sentences (4 points).

Explanation:

4.The Great Unconformity of Powell in the Grand Canyon is a regional unconformity that separates the Tonto Group from the underlying, faulted and tilted sedimentary rocks of the Grand Canyon Supergroup and vertically foliated metamorphic and igneous rocks of the Vishnu Basement Rocks.

5. They may form at all types of plate boundaries, but the thickest sedimentary rock accumulations occur at convergent plate boundaries. Metamorphic rocks are formed mainly in the lithosphere, wherever there is high pressure and high temperature.                                                                               6. One of the best-preserved records of these events is in the bottom of the Grand Canyon—in a package of sedimentary strata known as the Tonto Group.

I hope this helps