Name three environment concerns affecting our oceans today and their casuses?

How is the savanna sustained? Many ocean creatures make their shells out of calcium carbonate. This process is more difficiult when the ocean pH is lower. Why would greenhouse gas emissions harm these creatures? What is the approximate age of the Atlantic Ocean seafloor rocks in million of years? What is the difference between an ocean and a see? Which continent is borders by the Bay of Bengal and the Sea of Okhotsk? Who was the first purson to climbe mount Everest? What food is grown at santa cruz? What can you see in a park? What weapon did they use to defened a motte and bailey castle? A slogan for extreme splash water park? Is the Mississippi river the Columbia river or the Rio gran? Is the sonoran derest located in the southwest or the northeast part of the us? What is the temperature of the Atlantic ocean near Savannah Georgia in early June? What is the function of the Empire State Building built? Physical factors responsible for development of tourism industry? How many different types of organisms live in rivers? What is type of settlement for a beach? Where is Walt Dinsney World? Disadvantages kelvin double bridge? What the name of the river that runs threw three forks Montana?