1. How can we show change in science?

2. The earth is constantly changing
The earth is constantly changing. This change may occur suddenly (eruption of a volcano) or over long periods of time (formation of a mountain). Factors that are involved in these changes are called VARIABLES.

3. If we were to measure the temperature throughout the day every hour, time and temperature would be our variables. Graphing the variables is helpful in showing the kind and rate of change that occurs between the variables.

4. The known variable (time) is ALWAYS graphed on the horizontal (x) axis
The known variable (time) is ALWAYS graphed on the horizontal (x) axis. The shape of the graph line shows what kind of change occurred.

5. The steepness of a line graph is indicative of RATE OF CHANGE.
Look at page 1 in your ESRT’s.
What’s the formula for rate of change?

6. Rate of change =
Change in field value
time

7. The steeper the line, the faster the rate of change.
Which event occurred faster? A or B

8. Independent variable – the variable you know
· Not dependent on anything (this is not what we are trying to find out)
·  Goes on the x-axis

9. Dependent variable – depends on the independent variable
· What you are trying to find out
· Goes on the y-axis

10. Independent Variable

11. If you were to graph how the temperature changes throughout the year, what would your variables be?
Independent:
Dependent:
WHY?
Time (months)
Temperature

12. How to set up your axis
·  Spread out data over entire range (you do not have to start at 0)
·    Use equal intervals
not

13. Types of relationships
1. Direct: As x increases, y increases or as x decreases, y decreases
· Both variables move in the same direction

14. Types of relationships
2.Inverse: As x increases, y decreases or as x decreases, y increases
·  Variables move in opposite directions

15. Types of relationships
3. Constant (stays the same): as x increases, y stays the same

16. What is it called when the environment stays the same?
(example – trees die, trees are born … overall the number of trees stays the same)
DYNAMIC EQUILIBRIUM

17. Types of relationships
4. Cyclic: as x increases, y varies
·  Occurs over and over in patterns
· Many changes on earth are cyclic

18. Examples of cyclic patterns on earth:
Moon phases
Seasons
Rock cycle
Water cycle

19. Graph Vocabulary
Interpolation – an estimate of a figure that falls between points in a line graph
Extrapolation – an estimate of a figure that falls outside the points on a line graph

21. *direct relationship!

22. Once upon a time there was a student who loved candy!

23. The student ate candy for EVERY meal. Breakfast, lunch and dinner.
What happens to your teeth, when you eat candy: 24 hours a day, 7 days per week?

24. His dentist told him to sue the candy company, so he made a graph of his data….

25. Direct relationship graph AS Y-axis (dependent Variable)
Candy eaten
cavities
1 grams 2
2 grams 4
3 grams 6
4 grams 8
----- Meeting Notes (9/22/15 09:12) -----
X-axis
(Independent variable)

26. Once upon a time there was a man with a huge afro
Once upon a time there was a man with a huge afro! The afro was 12 inches long!

27. The man was really proud of his afro!
The next day he used two bottles of the shampoo and his ‘fro shrank eight inches!
The third day he used four bottles of the shampoo and his ‘fro shrank to six inches!
The man was really proud of his afro!
He used one bottle of the shampoo and his ‘fro shrank 10 inches!
He heard that “Head and Shoulders” shampoo would make his hair grow even longer!
Kept using more and more shampoo and after a while he looked like this
I’m really proud of my afro!

28. His lawyer told him to sue the shampoo company after he formulated a graph and plot the data.

29. Inverse relationship graph AS Y-axis (dependent Variable)
Bottles of shampoo used
Height of hair in inches 12 1 10 2 8 3 6
X-axis
(Independent variable)

30. Independent work: sun spot graph analysis lab
Read the directions.
construct a line graph and interpret graphs
answer all the discussion questions.