Why is the ocean blue? People have wondered this for hundreds of years. One idea is that it reflects the sky.

From the coast, it may appear a deep blue on a sunny day. Or gray … Without the ocean, life as we know it wouldn't be possible. There are a number of key reasons why. First, the ocean is the largest source of oxygen on earth. According to scientists, approximately half … Explore how the ocean shapes life on earth.

First, the ocean is the largest source of oxygen on earth. According to scientists, approximately half … Explore how the ocean shapes life on earth. It sustains us, surprises us, and holds mysteries we're only beginning to understand. Dive into key topics here. Discover the ocean learning hubâ€your gateway to trusted ocean science content. Easily explore by topic, media type, grade level, and educational standards.

Discover the ocean learning hubâ€your gateway to trusted ocean science content. Easily explore by topic, media type, grade level, and educational standards.