Which type of fossils form from hardening sediment? A. casts
B. tar pit fossils
C. carbon films
D. amber fossils

A. Casts

Explanation:

A mold fossil forms when the remains of an organism leave a mark in sediment that hardens before the organism rots or is washed away. Sediment can then fill in that mold, forming what looks like a sand or clay version of the organism; this is called a cast fossil.

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