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How fossils form

3rd grade (Year 4 in England) · 10 questions · Common Core: NGSS.3-LS4-1, NGSS.4-ESS1-1 · England: KS2 Y3 Rocks, KS2 Y6 Evolution and inheritance

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1
Question 1
In how a fossil forms, what happens straight after "an animal dies"?
- A. it is quickly buried by mud or sand
- B. the soft parts rot away
- C. the rock is worn away and the fossil is uncovered
- D. minerals slowly replace the bones over millions of years
2
Question 2
Why do most fossils show bones, teeth and shells rather than skin?
- A. Hard parts last longer; soft parts rot quickly
- B. Animals had no skin
- C. Skin turns into rock straight away
- D. Scientists remove the skin
3
Question 3
In how a fossil forms, what happens straight after "the soft parts rot away"?
- A. the rock is worn away and the fossil is uncovered
- B. an animal dies
- C. it is quickly buried by mud or sand
- D. minerals slowly replace the bones over millions of years
4
Question 4
Why do most fossils show bones, teeth and shells rather than skin?
- A. Hard parts last longer; soft parts rot quickly
- B. Skin turns into rock straight away
- C. Animals had no skin
- D. Scientists remove the skin
5
Question 5
In how a sea shell becomes a fossil, what happens straight after "the sediment slowly turns into rock"?
- A. the fossil is found in the rock millions of years later
- B. layers of sediment cover it
- C. a sea creature dies
- D. its shell sinks to the sea floor
6
Question 6
A fossil is found in a deep rock layer. Another is found in a layer near the top. Which is probably older?
- A. it is impossible to say anything
- B. the fossil near the top
- C. the fossil in the deeper layer
- D. they are the same age
7
Question 7
In how a fossil forms, what happens straight after "minerals slowly replace the bones over millions of years"?
- A. an animal dies
- B. the rock is worn away and the fossil is uncovered
- C. it is quickly buried by mud or sand
- D. the soft parts rot away
8
Question 8
A fossil is found in a deep rock layer. Another is found in a layer near the top. Which is probably older?
- A. it is impossible to say anything
- B. they are the same age
- C. the fossil in the deeper layer
- D. the fossil near the top
9
Question 9
In how a sea shell becomes a fossil, what happens straight after "layers of sediment cover it"?
- A. a sea creature dies
- B. its shell sinks to the sea floor
- C. the sediment slowly turns into rock
- D. the fossil is found in the rock millions of years later
10
Question 10
In which type of rock are fossils usually found?
- A. metamorphic only
- B. igneous
- C. sedimentary
- D. lava

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