Space, Earth and the natural world, explained.
Mount Everest could sink into the Mariana Trench and still sit more than a mile underwater. Here is how deep the ocean really is, how scientists measure it and how little we have mapped.
A tsunami starts when the seafloor or a mountainside moves water from the bottom up. Here is how that becomes a fast, ocean-crossing wave, what the warning signs are and what NOAA's alerts mean.
Below 200 meters the ocean turns dim, cold and crushing, yet it is full of life. A zone-by-zone guide to the animals scientists have found there and the tricks that keep them alive.
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