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# Land vs. Water (page 2)

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Author: Sarah L.

2011 VIRTUAL SCIENCE FAIR ENTRY

### Abstract

The goal of this project was to examine the ways in which solar radiation affects the heat of two different surfaces, land and water. Over the course of three days, I tested the temperature of water and land at the same exact time of the day each day. Results showed that water surfaces warms more QUICKLY than land, but land can hold the heat longer.

### Objective:

To determine whether land or water warms more quickly or faster. To investigate how solar radiation increases the temperature of surfaces.

Also to determine that posts about land warming faster are false,so I am going to test it and get which is really warms faster.

### Materials:

• 2 thermometers
• 2 plastic boxes (These should be exactly alike.)
• Sand
• Water
• Timer

### Terms and Concepts for Background Research

• Reflection: How does solar radiation warm surfaces?
• Energy: Why does land absorb more solar radiation than water?
• Heat
• Temperature

### Research Questions:

Does land or water warm faster?

Also to determine that posts about land warming faster are fasle,so I am going to test it and get which is really warms faster.

### Hypothesis:

My hypothesis is that water will warm faster than land.

### Procedure:

1. Pour sand into one of your plastic boxes to a depth of two inches.
2. Pour water into the other plastic box to a depth of two inches. The sand box will represent land while the water box represents a body of water.
3. Place the two boxes in a location that receives direct sunlight.
4. For a period of 30 minutes, check the temperature of both boxes every 10 minutes. Make sure to put the thermometer down into the sand and water to get an accurate temperature of each material. Record the temperatures in a chart (see sample below) or plot the points on a graph.
5. Look at your data. What do you notice about the temperatures of the sand and the water? Did the temperature of the sand or water heat up faster?

### Results:

 Sand Water Temperature after 10 min. 60 °F 63 °F Temperature after 20 min. 63 °F 65 °F Temperature after 30 min. 66 °F 62 °F

Land vs. Water

Date
Time Passed          (Every 10 Min.)
Land (Sand)          Temp. (F)
Water                   Temp. (F)
Day 1
2/26/11
3:50
60
°F
63
°F
Water is 1
°F hotter
2/26/11
4:00
63
°F
65
°F
Water is still in the lead.
2/26/11
4:10
66
°F
62
°F
Water has just dropped and land is higher.
2/26/11
4:20
68
°F
65
°F
Water is getting back up, but it not as high as land.
2/26/11
4:30
70
°F
71
°F
Wter made it higher than land.
Day 2

2/27/2011
3:50
73
°F
75
°F
Water is starting higher.
2/27/2011
4:10
78
°F
76
°F
Water dropped and land got higher.
2/27/2011
4:20
78
°F
74
°F
Water is still lower, but land stayed the same.
2/27/2011
4:30
79
°F
79
°F
Wter seems to be heating up faster, but lets go of the heat.
Day 3

3/2/2011
3:50
65
°F
68
°F
Water seems to be higher than land.
3/2/2011
4:00
69
°F
72
°F Water seems to be higher than land.
3/2/2011
4:10
74
°F
71
°F
Water and land are at the same temperature.
3/2/2011
4:20
77
°F
75
°F
Water is still lower than land.
3/2/2011
4:30
79
°F
79
°F
Water and land are at the same temperature.

### Conclusions:

My hypothesis was that water warms up faster than land and I was correct.Solar radiation warms both land surfaces and water on our planet. Land surfaces absorb much more solar radiation than water,but the question was which warms up faster. Water warms up faster than land, but reflects most solar radiation that reaches its surface back to the atmosphere.This is due to the fact that most land surfaces are darker than water which of course means more absorption of solar radiation and heat. Since land absorbs more solar radiation the land surface retains more heat as do the vegetation for energy. Thus, water surfaces warms more QUICKLY than land, but land can hold the heat longer.

### Bibliography

Land and Water Magazine