NASA's Mars Rover Finds Evidence of Ancient Volcanic Explosion

NASA's Mars Rover Finds Evidence of Ancient Volcanic Explosion
NASA's Mars Exploration Rover Spirit has discovered evidence of an ancient volcanic explosion at "Home Plate," a plateau of layered bedrock approximately 2 meters ( 6 feet ) high within the "Inner Basin" of Columbia Hills, at the rover's landing site in Gusev Crater. This is the first explosive volcanic deposit identified with a high degree of confidence by Spirit or its twin, Opportunity.