Chp 11 Interactive Science Trip Through Geological Time

A fossil is...

• Any dead organism

• The preserved remains or traces of an organism

• A perfect copy of a rock

• An unusual type of rock

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NGSS.MS-LS4-1

How do most fossils form?

• Livings things die and their remains are buried by sediments

• the hard parts of an organism dry out in the air

• The soft parts of an organism change to stone

• A fossil formed when minerals replace all or part of an organism is called a...

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A fossil formed when minerals replace all or part of an organism is called a

• mold

• petrified fossil

• cast

• trace fossil

________ can provide clues about the activities of ancient organisms?

• trace fossils

• remains preserved in amber

• carbon films

• molds and casts

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NGSS.MS-LS4-1

The process by which all the different kinds of living things have changed over long periods of time is called________

• Sedimentation

• replacement

• deposition

• evolution

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A type of organism that no longer exists on Earth is said to be _______.

• Fossilized

• sedimentary

• extinct

• petrified

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The relative age of a rock is ________

• its age compared to the ages of other rocks

• Less than the age of the fossils the rock contains

• The number of years since the rock formed

• Its age based on how much carbon-14 the rock contains

The law of superposition states that, in horizontal layers of sedimentary rock, each layer is _______

• younger than the layer above it and older than the layer below it

• neither older nor younger than the other the layer below it

• older than the layer above it and younger than the layer below it

• Always older than any vertical layers

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The fossils of organisms that were widely distributed but only lived during a short period of time are called _______

• trace fossils

• petrified

• index fossils

• carbon film

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Radioactive decay occurs when atoms of an unstable element ___________

• Become part of a fossil

• Join with atoms of another element

• break down to form atoms of another element

• Are exposed to chemical weathering

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