Where is the wall made by king zulkarnain?

Are the majority of zoos good or bad? Which places have you visited so far? What is it called a smaller stream that runs into a larger river? What people think about emperor Qin nowadays? Which is larger the nile river or the schkyll river? How many rivers flow into the Mississippi River and what the tributes? Is the Sahara and the Sahara Desert the same thing? What are the function of the international civil aviation? Is there any evidence that george mallory made it to the top of mount Everest? Where is the colosseum in rome? Is the Atlantic Ocean still or tide? Why is there light and dark patch in the ocean floor when you look at the sea? Is the abyssal plain the deepest in the ocean? Land with water on three sides? How does the flora and fauna of coral reefs adapt to their environment? How a zookeeper could make sure only females hatch from the eggs? Why do currents move in a circular patterns? Why cebu city is consedered the quezon city of the south? How does a river or stream flow at the mouth? What is amusement park?