Mold
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Example:
Imagine losing your keys in a snowstorm and only finding their shape outlined in the snow after they melt away. This is similar to how a rock fossil mold is formed when an organism buried in sediment dissolves, leaving behind an impression. Just like the keys leave an imprint in the snow, the dissolved organism leaves a mold in the rock, capturing its shape even though the original object is gone.
Practice Version
Mold: A rock fossil created when a buried organism dissolves. Mold. Mold is a hollow space in the shape of a once-living thing.