We know Mars as a terrestrial planet consisting of minerals containing silicon and oxygen, metals, and other elements that typically make up rock. The surface of Mars is primarily composed of tholeiitic basalt, although parts are more silica-rich than typical basalt and may be similar to andesitic rocks on Earth or silica glass. NASA has just released a video showing what a young Mars could have looked like billions of years ago with flowing water on its surface. Continue reading to watch.