Graphing Texas Weather 2 by 5G3SdE

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									7th Grade Science                                                                    Process Skills

                            Graphing Texas Weather
                                   Teacher Instruction Page


Background
The main focus of this activity is to reinforce graphing skills.


Materials
“Graphing Texas Weather” Student Page
Rulers
Map Pencils


Procedure
Using the first two pages of the student handout, review basic graphing concepts.
Students will then make two graphs using the information found in the data tables.

Some points to reinforce might include:
   Title
   Axis Labels
   Axis Scales
   Uniform Intervals for Scales
   DRY MIX
        o Dependent
        o Responding
        o Y-axis
        o Manipulated
        o Independent
        o X-axis
   How to use the whole space
   Neatness

You may extend this activity by asking students to interpret the graphs.
Possible discussion:
    Which of the four Texas cities is the wettest?
    What type of ecosystem would you expect to find in El Paso? Why?
    Compare the annual temperature patterns found in Amarillo and Houston.
    Look at a map of Texas. Locate the four cities. As you move westward across
      Texas, what happens to the amount of rainfall?
    What is the difference in rainfall between San Antonio and Houston?
    Predict Amarillo’s temperature for the month of October.




SBISD                                                                                    Fall 2009
7th Grade Science                                                                            Process Skills

Name_____________________                                                            Period________


                            Graphing Texas Weather
                                             Student Page

What is a graph?

During an experiment, you organize the data into a chart or table. A graph puts this information into a
picture form. Study the following example which shows how a graph is a just a picture of a data table.




How do I make a graph?

       The independent (manipulated) variable is written on the x-axis.
        The dependent (responding) variable is written on the y-axis.

        Remember!      DRY MIX

       Label each axis with the name of the variable and the unit used to measure the variable.
        Examples of units are inches, grams, centimeters, and degrees Celsius.

        Example:    Tree Height (meters)

       Study your data and create intervals within the scale to put on each axis.

        Example: On the graph above, the time in years is measured every four years beginning
                 with 1998.

       Carefully plot the data points on the graph.

       Put a title on your graph.

       Use a ruler to draw your lines.

       Be neat!

SBISD                                                                                            Fall 2009
7th Grade Science                                                                              Process Skills

When do I use a bar graph and a line graph?

A bar graph is used when the independent variable involves distinct types or separate categories.
The data is not continuous or connected.

Examples:
      1. A graph of the speed(responding variable) of different types of cars (independent variable)
      2. A graph of the weights of different types of insects
      3. A graph comparing the number of tornadoes in five different states




A line graph is used when the data is continuous and the data is not in separate categories.
In a line graph, the data is collected over a period of time or there is a direct connection between the
data. A line graph may have more than one line.

Examples:
      1. Graph shows the growth of plants for several weeks
      2. Graph shows how the heart rate changes as exercise time increases
      3. Graph shows how the population of deer changes over ten years
      4. Graph shows how the number of paper towels affects the amount of water absorbed




SBISD                                                                                              Fall 2009
7th Grade Science                                                                          Process Skills

Graph # 1       Use the graphing guidelines on the previous pages to help you create a graph of the
                information in the data table.


            The data table compares the average annual rainfall of four cities in Texas.

                        Average Annual         What is the independent variable? _________________
    City in Texas       Precipitation (cm)
                                                What is the dependent variable?_________________
  Amarillo                    48
                                                Should you use a bar or a line graph? Why?
  El Paso                     23

  Houston                     51                ______________________________________

  San Antonio                 31                _________________________________________




SBISD                                                                                          Fall 2009
7th Grade Science                                                                          Process Skills

Graph # 2       Use the graphing guidelines on the previous pages to help you create a graph of the
                information in the data table.

          The data table compares the average monthly temperatures of two cities in Texas.

                                 Average Monthly Temperature °C
City in
Texas              January       March           May            July       September       November


 Amarillo             2             8             14            26             21              8

 Houston              10            16            24            28             26              16


What is the independent variable?___________________________________

What is the dependent variable?____________________________________

Should you use a bar graph or a line graph? __________ Why?______________________________




SBISD                                                                                          Fall 2009

								
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