Volcanoes and earthquakes are among Earth’s most dynamic and interesting forces, but their origins have remained a bit elusive. Plate tectonics are the result of a cosmic collision about 4.5 billion years ago, when an object about the size of the planet Mars slammed into Earth. The impact left behind some strange blobs within our […]
MARCIA BIGGS: The former commander of coalition forces in Iraq, Lieutenant General Stephen Townsend, recently listed 81 locations where bombs were dropped, but had not yet exploded. Facilities used to make weapons were often on the list of high-value targets for the coalition. So now those places are twice as likely to contain dangerous items. […]