6.3 Fossils and Extinction

How do fossils form

• an insect becomes trapped in amber

• an entire organism becomes frozen in ice.

• a dead organism becomes buried in sediment

• All of the above

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Which of the following is most likely to become preserved as a fossil?

• a leaf

• a worm

• jelly fish

• clam shell

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Explain why there are no fossils of many early forms of life

• Early forms of life where too soft to form fossils

• Early forms of life were very, very small so finding fossilised remains is very difficult.

• Most dead organisms do not form fossils they decay

• All of the above

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Which of the following is NOT an example of a fossil?

• a petrified dinosaur bone
• a footprint captured in mud
• a seashell found on the beach
• an insect stuck in amber

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Which of the following is NOT something you could learn from a fossil?

• The size of the animal
• What the animal ate
• The color of the animal
• Where the animal lived

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In which kind of rock do we usually find a fossil?

• sedimentary  rock
• metamorphic rock
• igneous rock

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What do Fossils show us?

• Exactly what dead organisms looked like

• How much or how organisms have changed over time

• How organisms have stayed the same

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In the Picture - Where are the oldest fossils of the organisms that lived longest ago found?

• At the bottom

• At the top

• In the middle

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In order for a fossil to form, which one of the following 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.

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When a fossil forms, which of the following events happens last?

• Water flows into the cast and minerals in the water replace the animals bones.

• Sediment covers the dead animals bones.

• The bones decay.

• The layers of sediment compacts the animals bones.

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