ROCK OF AGES Plate tectonics may have started as early as 3.5 billion years ago on Earth. That recycling of Earth’s surface leads to the separation of light-colored continental crust (exposed here at Yosemite National Park’s Half Dome) from darker, denser oceanic crust.
IRMA INCOMING Hurricane Irma passed by Cuba on September 8, 2017, as a Category 4 storm (seen in this geocolor image captured by NOAA’s GOES-16 satellite) before making landfall in the Florida Keys on September 10, 2017.
Engineer Jon Sinnreich of the University of Florida and colleagues work on a portable tower used to measure wind speeds during Hurricane Irma. Scientific data from hurricanes and other natural disasters help inform efforts to prepare for future crises.