MARS Mars is the planet most like Earth in our solar system. Believe it or not, Mars once had lots of water. We know this because we have evidence. We have found deltas on Mars. On Earth, running water forms deltas. Here’s how. Streams and rivers pour


into lakes or oceans. T e rushing water quickly carries away soil and rock called sediment. Sediment slowly sinks to the floor of the lake or ocean. It piles up to create a delta. Images from space show the same


type of sediment built up in places on Mars. T e water’s all gone now. Yet the outlines of a delta are still there.


Long ago, sediment from this delta on Mars piled up slowly on an older lake bed.


Bits of rock and soil carried by water are slowly forming the Volga River Delta on Earth.


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