Determine which covering affected soil temperature the most. Analyze data and make conclusions concerning how soil coverings affect soil temperature. Analyze the relationship between soil covering and its effect on soil temperature. It affects not only the object but the air above it. Use the same type of soil to reduce the effect of other variables such as soil texture and moisture.
Students generate a hypothesis that relates to the lab.
Students predict which covering will have the greatest effect on soil temperature. Have copies of data table ready to hand out if instructor chooses to use it. Place 15 cm of soil into each of the four plastic milk jugs. Mark thermometer 2.5 cm from the bottom of its bulb. Make sure the mark does not cover any part of the scale.