What causes the most damage to wetlands?

Who were the engineers of the Sydney Harbour bridge? Does the Tower of London have any moats? Is it true that the pharaohs had a canal built connecting to the nile to the red sea opening up trade routes to Arabia? Why are the terracotta warriors unique? Lakes in front of taj mahal? What are the Major water currents in Canada? Which river has largest drainage pattern in India? Which 2 countries are the only ones not to have a sea coastline? Why was Spain able to restrict American shipping on the lower Mississippi river during the late? Which of the seven Wonders of the World still stand today? Where is the Imperial Valley Pioneers Museum in Imperial California located? Is the mouth of the Tigris River the Persian Gulf? How much percentage of water does the Southern Ocean hold? How cold can California deserts get vs a Antarctica desert? What is wrong with the desert? Is the sea of cortez part of the pacific ocean? List all the states that the Mississippi River runs through? Who has control of the Suez canal? Who is Matt in Six Flags fun park? How does a canal flow over a hill?