2013 Event Calcium deposits found on Mars by NASA's Curiosity rover; the deposits are similar to deposits formed on Earth when water circulates in cracks and rock fractures 2012 Event NASA reports its Twin GRAIL probes studying the surface of the Moon reveal unexpectedly-deep cracks, craters and tectonic structures 1916 Event Dutch South Sea dike cracks 1835 Event Liberty Bell cracks, again 1621 Event English king James I cracks Protestation of Parliament
