A test question for third graders studying about the universe asked what color the Earth appeared from space and why. The answer to this question is simple to an adult, it’s a widely known fact. It’s blue. The Earth from space appears blue, as it primarily covered by water – approximately 71 percent of it, in fact. It is one of the most important substances on Earth and absolutely necessary for survival. However, within the oceans’ seabeds lies one of Earth’s most important natural resources.