Which type of fossils form from hardening sediment? casts
tarpit fossils
carbon films
amber fossils

The correct answer is casts, molds, and trace fossils.
The types of fossils form from hardening sediment are casts, molds, and trace fossils.
A fossil is the rest or record of an organism where you can see the texture, the size, and shape of it., such as skin, body bones, and teeth. There are three types of fossils. Its formation is different. These are mold fossils, cast fossils, trace fossils.
A mold fossil has a fossilized imprint in the substrate or rock where a fossil is marked. Cast fossils contain minerals in the rock. Trace fossils or ichnofossils, don’t have information from the organism, but fragments or traces left by it.

Gravitational force i believe