Question

which type of fossils form from hardening sediment?

casts
tar pit fossils
carbon films
amber fossils

Explanation:

Analyze the question prompt

The question asks which type of fossils form from hardening sediment.

Evaluate the given options

• casts: A mold is created when an organism is buried in sediment and decays, leaving a cavity. When mineral-rich water or sediment fills this cavity and hardens, it forms a cast fossil. Thus, casts form directly from the hardening of sediment/minerals inside a mold.
• tar pit fossils: These form when organisms are trapped and preserved in asphalt/tar, which is not a hardening sediment process.
• carbon films: These form when an organism is compressed, leaving a thin residue of carbon outline on rock.
• amber fossils: These form when organisms are trapped in sticky tree resin that hardens over time.

Determine the correct choice

Casts are the fossil type among the choices that form directly from sediment or minerals hardening inside a mold cavity.

Answer:

• (A) casts (Correct answer)
• (B) tar pit fossils
• (C) carbon films
• (D) amber fossils