The scientific explanation behind the weird rock is that this kind of rock was formed thanks to the presence of water on Mars’ surface in the ancient past. Scientists call it a “concretion”. Ian O’Neil from Discovery News, who is quoting NASA, explains: “Other examples of concretions have been found on the Martian surface before — take, for example, the tiny haematite concretions, or ‘blueberries’, observed by Mars rover Opportunity in 2004 — and they were created during sedimentary rock formation when Mars was abundant in liquid water many millions of years ago.”
Curiosity Rover is currently at the base of Aeolis Mons, Mount Sharp and there it searches for other signs of habitable environments. It will continue by climbing up the slope, but until then mission managers are slowly preparing everything.