How Do Fossils Form

Select the Correct order

For a fossil to form.

1 Rock hardens and form a fossil. 2 Animal dies and have to be quickly buried. 3 Minerals fill the mold to form a cast fossil. 4 Water dissolves the soft parts leaving a fossil mold.

• 1, 2, 3, 4

• 2, 3, 1, 4

• 2, 4, 3, 1

• 4, 3, 2, 1

The process of how an organism is formed into a fossil is called

• Fossilization

• Metamorphosis

• Decompostion

• Discovery

Which step in fossilization comes first?

• An animal dies and the soft part of the body decay.

• Over time, layers build pressure that turn the layers to stone.

• Wind and water erosion expose the fossil to the surface.

• Minerals around the skeleton preserve the bones.

Of these choices, which step is second in fossilization?

• The animals dies and the soft parts of the body decay.

• Minerals around the skeleton preserve the bones.

• Wind and water erosion expose the fossil to the surface.

• The animal is buried under layers of dirt and sediment.

In order for a fossil to form, which of the following events must happen FIRST?

• Slowly, minerals in the water replace the bone.

• Sediment covers the bone.

• An animal dies.

• The bone is no longer a bone, but a rock copy.

Explain how a cast fossil is different from a mold fossil.

• cast fossil is the actual organism, while a mold fossil is an imprint.

• cast fossil is formed from minerals filling a mold, while a mold fossil is an empty space left by a decayed organism.

• cast fossil is formed from the organism's bones, while a mold fossil is formed from its skin.

• cast fossil is found in sedimentary rock, while a mold fossil is found in igneous rock.

Tags

DOK Level 2: Skill/Concept

What is the main difference between a cast fossil and a mold fossil?

• A cast fossil is a 3D impression of the organism, while a mold fossil contains the actual remains.

• A mold fossil is a hollow impression of the organism, while a cast fossil is a 3D model created when the mold fills up.

• A cast fossil is made of amber, while a mold fossil is made of sediment.

• There is no difference; they are the same type of fossil.

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DOK Level 2: Skill/Concept

Why are molds and casts considered types of fossils?

• They are forms of rocks

• They are types of minerals

• They show the external or internal surface of an organism

• They are created by humans

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DOK Level 2: Skill/Concept

What is a fossil?

• A type of rock that glows in the dark

• The remains or impression of a prehistoric organism preserved in rock

• A type of plant that grows in the desert

• A type of cloud found in the sky

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NGSS.MS-LS4-1

Where are fossils usually formed?

• in rock

• in sedimentary rock

• in ice

• in metamorphic rock