Question

part 6: challenge question
explain why sedimentary rocks often contain fossils, while metamorphic rocks rarely do.

Explanation:

Sedimentary rocks form from sediments (including remains of organisms) that accumulate in layers. The process of lithification (compaction and cementation) occurs at relatively low temperatures and pressures, which allows fossils (preserved remains of ancient organisms) to be retained. Metamorphic rocks, on the other hand, form under high - temperature and high - pressure conditions. These conditions cause minerals to recrystallize and any original fossils (if present in the parent rock) to be destroyed or altered beyond recognition.

Answer:

Sedimentary rocks form from sediments (including biological remains) under low - temperature and low - pressure lithification, preserving fossils. Metamorphic rocks form under high - temperature and high - pressure, destroying or altering fossils.