A scientist used a laboratory model to test the effect of radiation, or the sun, in heating land and water on Earth. To do this
experiment, 200 mL of water and dry sand were placed in to 2 separate 250-ml beakers. Each beaker was then placed under the
same lamp. Temperature readings were taken of each substance every 2 minutes for 8 minutes.
Use the data table to answer the following questions.
Starting Temp (°C)
2 min
4 min
6 min
8 min
Substance Heated
Water
Dry Sand
18.5
19.5
21
22
3333333333 18333333333333333320
24
26
Is this a controlled experiment? Explain.
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