Formation of Fossils

Where are fossils usually formed?

• in rock

• in sedimentary rock

• in ice

• in metamorphic rock

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.

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.

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

During a field trip, Nawar and his friends discover a bone in a riverbed. In order for that bone to eventually become a fossil, 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.

Of these choices, which step is third in fossilization?

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

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

• Minerals around the skeleton preserve the bones.

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

Of these choices, what is the fourth step of fossilization?

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

• Minerals around the skeleton preserve the bones.

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

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

Select the Correct order

For a fossil to form.

Rock hardens and form a fossil. Animal dies and have to be quickly buried. Minerals fill the mold to form a cast fossil. 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

In which type of rock can fossils be found?

• igneous 

• sedimentary

• obsidian

• metamorphic

Tags

NGSS.MS-ESS2-3

NGSS.MS-LS4-1