7. Observe the jars and record how long it takes the ice to melt in each of the jars. (Create a Lab 4: Greenhouse Effect simple table in which to record your observations.) Materials: 7a. If you have thermometers, record the temperature in each jar every five Two large, clean jars of the same size (such as the size of jar that dill pickles come in) minutes until the ice is melted. One piece of plastic wrap or a recycled plastic bag (Ziploc or grocery; only needs to be large - enough to cover opening of one jar) 7b. If you do not have thermometers, every ten minutes until the ice melts, extend One rubber band your index fingers into the jars. (For the covered jar, you will need to slightly Four ice cubes, all the same size uncover the plastic from the jar - only move it enough to insert your finger - do not remove the covering completely.) Do this at the same time for both jars and Two thermometers (optional) don't touch the jar itself. 8. Comment on any differences in temperature that you observe for each of these "temperature checks". (Record this in the table you created.) Procedure: (Note: this method will not use numbers - you are simply commenting on whether the 1. Find a location in your house which will allow you to set the two jars, side by side, in a inside of one jar seemed warmer than the other, by how much (a little, a lot?), and in sunny spot for a length of time, such as a window sill or patio door (at least 20 minutes) which jar.) You can also set them outside in the sun, as long as the outside temperature is not extremely low. This is where you will place the jars after you have prepared them for the 9. Answer the Experiment Questions given in the lab. experiment. Prediction Questions: 2. Answer the Prediction Questions given in the lab. 1P. In which jar will the ice cube melt faster? 3. Place two ice cubes into each of the jars. 2P. Will the temperature inside one jar be different than inside the other jar? Which do you predict will be warmer? If you have thermometers, place one into each jar. Place them so that you can read the thermometer without removing it. Do not place thermometers in contact with ice/water. You want air temperature inside the jar. You may want to carefully tape them to the Experiment Questions: inside of the jars. 1. Was there a difference in the amount of time it took for the ice to melt in one jar compared to the other? If so, in which jar did the ice melt faster? 5. Cover one of the jars with the plastic (only the top - do not surround entire jar) and 2. Did your result match your predictions? How closely? If they did not match your secure the plastic with the rubber band around the mouth of the jar. (Do not use the lid of results, how were they different? the jar - no lids are used. 3. Review your observations. How are they related to the transfer of radiant energy? 6. Place both prepared jars, side by side, in the sunny location you chose. 4. How are they related to the "greenhouse effect"? 5. Relate the experiment to the greenhouse effect in the Earth's atmosphere