Why is there no oxygen in the north of the Caspian Sea?

What two oceans did the panama canal link? Coleridge sacred river? What is jamaica's most famous lake? Which explorer was the first to sight the pacific ocean? Does the dead sea attract any tourism? Do nkiller whales live in the Arctic Ocean? After which war did England and the Americans colonies gain Florida the Ohio river valley and parts of Canada? What do the Awa tribe call the amazon? What is the best ride at Luna park? How many rivers in northern Ireland? Who carved marble on the top of the ceiling of the Sistine Chapel? What are some problems that swamps face? What lies off the eastern coast of siberia in the sea of okhotsk? How do the maasai benefit from tourism? When was A State of Vine created? How did geographic location influence the civilization that existed 4000 years ago between the Tigris and Euphrates rivers? Where are the largest oil reserves in North America? Why do ocean currents relate to science? How do you get your neighbor to cut his tree down that is too close to the common wall? Which time period did eurypterids swim the ocean?