Well to start off did you know the ocean covers 72% of earths surface? It contains 97% of the planet's water. So far more than 95% of the deep sea remains unexplored. Did you ever wonder how deep the sea is? Does photosynthesis take place in the ocean and where? How cold is it? how 's the pressure down there? Is there oxygen and enough food? Well i'll be explaining and answering these questions for you.