A map shows the ozone hole above Antarctica in September, when it was the size of North America. The ozone protects the Earth from the sun's ultraviolet rays.

Wildfire smoke tracker shows where the air quality is at dangerous levels and where fires are burning in North America. ... The map below shows the level of PM 2.5.

Seismic waves pass through different geological features at different speeds. This map shows seismic speed in the Earth’s crust at 200 kilometers depth across the continental United States and ...

An online map gives you a close look at the birds' route north and when to expect their arrival as they travel across North America this spring. This map shows the journey of hummingbirds.

On April 8, the moon will slip between the Earth and the sun, casting a shadow across a swath of North America: a total solar eclipse. By cosmic coincidence, the moon and the sun appear roughly ...