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SOIL AND WATER GRAPHS Table 1 LIGHT ON TIME SOIL (°C) WATER (°C) 0 minutes 21 20 1 minute 21 20 2 minutes 22.5 20 3 minutes 23 20.5 4 minutes 23 20.8 5 minutes 24.5 21 6 minutes 24.8 21 7 minutes 25 21 8 minutes 25 21.5 9 minutes 25.5 21.7 10 minutes 25.5 22 Table 2 LIGHT OFF TIME SOIL (°C) WATER (°C) 0 minutes 25.5 22 1 minute 25.5 22 2 minutes 25 22 3 minutes 25 22 4 minutes 24.7 21.8 5 minutes 24.3 21.5 6 minutes 24 21.3 7 minutes 23 21.2 8 minutes 22.75 21 9 minutes 22.5 21 10 minutes 22 21 Remember Graphing Rules Line graphs show change over time. The dots represent the measurement for the time period and the line represents the change. Units should be evenly spaced and spread out as far as possible along both the x-axis and/or the y-axis. As much of the grid as possible should be used for the graph. A ruler should be used to draw the line that connects the dots. All units along both the x-axis and y-axis should have lines extended to the number/label. Graph Set-Up Help • Use math to help set up the graph • The lower left corner where X and Y axis meet on this graph needs to be labeled zero for both the x and y axis. (Be sure to extend lines to the number 0 on both the x and y axis.) • To use as much of the grid as possible, count the lines going along the x-axis (remember the corner is zero). Divide that number by the total number of minutes. The number you get is how many lines are between numbers. (Example 15 lines, 3 is the number you need to get to, so every 5th line is numbered to represent a minute.– ACTUAL MATH IS DIFFERENT) • Count the lines on the y-axis. Divide that number by the highest number you need to get to. The number you get is what you need to count by--Round up to the next easiest number to count by. (Example 20 lines, highest number is 59 = 2.95. So, each line is worth 3. You would count by threes (0, 3, 6, 9…)) • When plotting your dots, use the number of minutes and degrees. Connect your line using a ruler. Both the LIGHTS ON and the LIGHTS OFF graph are double line graphs. Use two different colors, one for soil and one for water.