bacteria - small cells that can cause disease (germs), planet - a large, round object in space (such as the Earth) that travels around a star (such as the sun)blsh, spacecraft - a vehicle used for traveling in space, valley - the low space between mountains or hills, flood plain - the area next to a river that often gets flooded, lakebed - the bottom of a lake, riverbed - path where a river flows (or used to flow), robot - a machine that can do things that humans can do, ice cap - a large area of ice on a planet,

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