A map showing seismic speed in Earth’s crust at 125 miles depth across the continental U.S. and portions of Central America and Canada. The North American craton (outlined in black dashes) has a ...

Hummingbirds are migrating back to Ohio from Mexico and Central America and are predicted to be seen throughout the state by the end of April. An interactive map tracks their migration and shows ...

This map shows seismic speed in the Earth’s crust at 200 kilometers depth across the continental United States and portions of Central America and Canada. The North American craton (outlined in ...