Word: craterous
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...exploded in Siberia's remote Tunguska region, leveling trees for more than 20 miles around and causing atmospheric shock waves that were detected round the world. At the time, scientists thought that a giant meteorite had crashed into the earth. Later, when they failed to find a major crater or clearly identifiable meteorite fragments at the site, they began to question their earlier theory...
...have left a deep blue trail of ionized particles like the streak seen by witnesses near the 1908 blast. Finally, the energy released by the black hole (comparable to that of a ten-megaton hydrogen bomb) could easily have caused the observed damage without leaving material residue or a crater...
...explore that river. Brother Jiri Kamel, a Moravian botanist at the Jesuits' College of Manila in the 17th century, gave Europe the camellia. A German mathematician and astronomer of the Society of Jesus, Christoph Klau, contributed to the Gregorian calendar and gave his Latinized name, Clavius, to a lunar crater that he discovered...
WITH a thunderous roar, hundreds of tons of dirt and rock dropped from sight, tossing trees around like matchsticks and leaving the yawning, lunar-like crater shown above. Now, after investigating the massive cave-in, which occurred last December in central Alabama's Shelby County, the U.S. Geological Survey has identified the crater as a "sinkhole." It may be the largest yet (as much as 425 ft. across and 150 ft. deep) in a growing number of such cave-ins that have pockmarked central and northern Alabama in recent years. Sinkholes often occur when the roofs of underground limestone...
...Apollo 17 Astronaut Harrison Schmitt poked around a lunar crater last December, he suddenly shouted, "Hey, there is orange soil! It's all over!" Schmitt's excitement was shared by scientists back on earth. Because the soil looked remarkably fresh and the crater resembled volcanic vents on earth, they speculated that volcanic activity might well have occurred on the moon as recently as 200,000 or 300,000 years ago. That would have upset the widely held view that the moon has been largely dormant for more than 3 billion years. Said NASA Geochemist Robin Brett...