1. Bellringer 09/11/14
Differentiate between a test variable and an outcome variable

2. Differentiate between repetition and replication
Differentiate between repetition and replication. Why are both important?
Bellringer

4. Topic: Theories and Laws
EQ: What are theories and laws?

5. If you see a movie in which early humans fight giant dinosaurs, how would you judge the scientific accuracy of that movie? Give reasons for your judgment.

6. Scientific Laws, Hypotheses, and Theories
In layman’s terms, if something is said to be “just a theory,” it usually means that it is a mere guess, or is unproved. It might even lack credibility.
Scientific Laws, Hypotheses, and Theories

7. EXAMPLES OF LAWS AND THEORIES

8. Scientific Laws vs. Theories
The difference between a hypothesis, law and theory is the amount of confirmed experimental evidence.

9. What is a Scientific Law?
a. A scientific law is a description of an observed phenomenon.
b. Explains what will happen does not explain why it happened…Ex. Gravity….

10. Scientific Law Gravity!
Based on direct evidence, and can be reproduced many times with the same result.
Example: The Law of Gravity.. What goes up must come down…
Gravity!

11. WHAT IS A THEORY?

12. What is a Scientific Theory?
A scientific theory is a well-supported, well-documented explanation of an observation. In other words an accepted hypothesis
Tells us how something happens..

13. Flexible enough to be modified if new data/evidence is discovered
In scientific terms, a theory implies that something has been proven and is generally accepted as being true.
Flexible enough to be modified if new data/evidence is discovered

14. records
How Theories are made…

15. Examples: Theories Theory of Plate Tectonics The Big Bang Theory
The Theory of Evolution

16. Plate Tectonics
Plate tectonics is the study of the processes that have formed the features of the earth.
Mountains
Mid Ocean Ridges

17. The theory of plate tectonics was introduced in the 1960s to explain how the Earth's plates move and to provide some understanding as to how volcanoes, earthquakes and tidal waves occur. The theory of plate tectonics also explains mountain range formation, ocean ridges and undersea trenches.
Why is plate tectonics a theory?

18. Plate Tectonics
In the 1800’s Alfred Wegener developed the Theory of Continental Drift.
His theory simply stated that the continents were moving.
But no one believed him. 

19. Why didn’t anyone believe Wegener?
He didn’t have enough evidence.
People thought a weatherman should stick to forecasting the weather.
Because Wegener wasn’t looking at the fossil evidence.
Because Wegener couldn’t explain HOW the continents were moving.

20. Plate Tectonics
Harry Hess began mapping the ocean floor during World War II.
He discovered a chain of mountains in the middle of the ocean!

22. 255 Million Years Ago
255 Million Years Ago

23. Present Day Position
Present Day Position

24. 250 Million Years From Now
250 Million Years From Now

25. Describe what is represented in this image.

26. People did once believe that the Earth was flat……

27. and the center of the Universe.

28. Let’s Review
What is the difference between a scientific theory and a scientific law?
Chapter 1 Section 3
Fall 2005, Pflugerville ISD

29. Answer
Theories are unifying explanations for broad range of hypotheses and observations. Laws are summaries of experimental results and observations.
Chapter 1 Section 3
Fall 2005, Pflugerville ISD

30. Hypothesis

31. Closing Activity: ISN 38 Directions:
Complete a double bubble map comparing theories and laws….
similarities
differences
differences
Laws
Theories