As sea levels rise, will all the elevation signs need repainting? And how do you measure sea level, anyway? The height of an enormous pile of rock like Ben Nevis, or Mount Everest feels unchangeable.

Curious Kids is a series for children of all ages. If you have a question you’d like an expert to answer, send it to [email protected]. If everyone on Earth sat down in the ocean, how ...

As it turns out, there are a number of clever systems in place that can accurately measure the global sea level down to less than an inch and a half. Not only are waves always rippling across the ...