Volcanic Activity Brought Mars Water to Surface

Two studies in the past year have supported the idea that large amounts of water once existed on Mars, likely flowing to the surface in large violent bursts to carve deep channels in catastrophic floods. Some of the evidence suggests that water may still reach the surface. But a longstanding question remains: Where did the water come from? New evidence indicates that much of the water may have been hauled to the surface by hot lava released during volcanic eruptions.