Which dynasty is responsible for building most of the great wall you see today?

Which mountains are older the Appalachian mountains of PA the green mountains of VT or the White mountains of NH? How might you correlate rock layers from the north wall of the grand canyon with rock layers from the south wall? What river flows through the capital of Rome? How are rivers harmed? What was barbican? Which empire controlled most of Asia Minor and some of the land east of the Mediterranean Sea? What ocean is corsica in? Why are animals in zoos instead of the wild? What is the term for an area that is made fertile by a source of fresh water in an otherwise arid region? Where is dover castle? What is the main land use of the upper course in a river? When was Kyu Sakamoto Memorial Best created? What do the shackles at Lady Liberty's feet represent? Do sharks eat coral reefs? What is the circle of volcanic mountains in the pacific ocean? This is the removal of trees and the conversion of forest lands to farmlands logged areas or cities.? Why would people build a wall out of rocks on a seashore? How did colonial rule set up tension in the eastern Mediterranean sub-region? Not including minnesota and louisisana there are twenty four states east of the Mississippi River how many states then are west of the river? Did Pope Julius II die before the completion of the Sistine Chapel?