How do you find a permeter of a delta?

How would rocks at the beginning of a river look different than rocks at the end of a river? How many flags are around the Washington monument? In what part of America is Peru located? Why is the first hill of a roller coaster always the highest? What type of volcano produced the caldera that covers most of Yellowstone National Park? Were The leading production areas in the US the Middle Atlantic and North Central states? How did Bryce Canyon get its name? How did Charles Adams die? What three states touch Canada and the Atlantic ocean? How many miles long is the Grand Canyon? How far is the Atlantic ocean from Hartford ct? What body of water goes under the channel tunnel? Does the mandrill live in the amazon rain forest? How did canals help people? What type of material and stone is CN Tower build of? Did the french establish trading post along the Ohio river? What happens to the deep sea organisms if they are brought to the surface? When the settlers arrived in new England many forests were turned into fields eventualy some fields were abandoned and then grew back into forests this is best described as? How might artificial reefs cause fishermen to thinking there are more fish before the artificial reef existed? What are the main ways sediment enters a river?