Skills Worksheet Directed Reading Chapter 1 Section 2

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Skills Worksheet

Directed Reading Chapter 1 Section 2

Section: Scientific Methods in Earth Science

1. What dinosaur was known as the "earth shaker"? ____________________________________________________________________

LEARNING ABOUT THE NATURAL WORLD 2. When scientists want to learn about the natural world, how do they begin the

process?

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WHAT ARE SCIENTIFIC METHODS? 3. What are scientific methods?

_______________________________________________________________ _______________________________________________________________ _______________________________________________________________ 4. What is the goal of scientists when they use scientific methods? ____________________________________________________________________ ____________________________________________________________________ ____________________________________________________________________

ASK A QUESTION

_____ 5. Why do scientists ask questions? a. to focus the purpose of an investigation b. to change the steps of the scientific method c. to evaluate research completed about a topic d. to lead an investigation into many directions

_____ 6. What did David Gillette already know when he started examining some bones discovered by hikers? a. They were dinosaur bones. b. They were leg bones. c. The bones were 10 million years old. d. The bones were from Seismosaurus.

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Directed Reading Chapter 1 Section 2 continued

_____ 7. What did Gillette know he needed to do to find out what kind of dinosaur the bones came from? a. use a telescope b. check to see if the ground was shaking c. use scientific methods d. work with an ecologist

FORM A HYPOTHESIS 8. What is a hypothesis?

_______________________________________________________________ _______________________________________________________________ _______________________________________________________________ 9. What hypothesis did Gillette form about the bones? ____________________________________________________________________ ____________________________________________________________________

TEST THE HYPOTHESIS 10. How do scientists test hypotheses?

_______________________________________________________________ _______________________________________________________________ 11. An experiment that tests only one factor, or variable, at a time is a(n) ______________________. 12. What is the purpose of changing only one variable in an experiment? ____________________________________________________________________ ____________________________________________________________________ ____________________________________________________________________ 13. What data did Gillette gather to test his hypothesis about the bones? ____________________________________________________________________ ____________________________________________________________________ ____________________________________________________________________

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Directed Reading Chapter 1 Section 2 continued 14. Why might scientists repeat experiments?

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ANALYZE THE RESULTS 15. What do scientists often do to organize and summarize their data?

____________________________________________________________________ ____________________________________________________________________ 16. What did Gillette find out when he analyzed his results? ____________________________________________________________________ ____________________________________________________________________ ____________________________________________________________________

DRAW CONCLUSIONS

_____ 17. Why do scientists draw conclusions about their results? a. to make sure their hypotheses are true b. to avoid asking new questions c. to make sure they made no errors d. to see if their results support their hypotheses

_____ 18. What can scientists do if their tests do not support their hypothesis? a. They may repeat investigations to check for errors. b. They keep careful records. c. They organize their data. d. They try to control all variables.

19. What conclusion did Gillette reach about the bones?

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COMMUNICATE RESULTS 20. How did Gillette communicate the results of his investigation?

____________________________________________________________________ ____________________________________________________________________ ____________________________________________________________________

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Name ______________________________ Class___________________Date__________________

Directed Reading Chapter 1 Section 2 continued 21. What do other scientists do when a scientist reveal new evidence?

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CASE CLOSED? 22. Why might an investigation continue after its results are accepted?

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Match the task that David Gillette performed with the correct step in the scientific method. Write the letter in the space provided.

_____ 23. found that the bones did not match any bones of a known dinosaur

_____ 24. concluded that the bones were from a yet unknown dinosaur

_____ 25. measured the bones and compared them with known dinosaurs' bones

_____ 26. wondered what kind of dinosaur the bones came from

a. Ask a question. b. Form a hypothesis. c. Test the hypothesis. d. Analyze the results. e. Draw conclusions. f. Communicate results

_____ 27. shared his results at a press conference and in a scientific journal

_____ 28. thought that the bones came from a dinosaur not yet known to scientists

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