| soil
temperature |
The GLOBE protocol tells you to reset the thermometer according
to manufacturer’s directions if there is a 2 degrees C temperature
difference between your thermometer and the calibration thermometer.
The calibration thermometer shows 13 degrees C. Which thermometers
should you reset?
thermometer 1 shows 14 degrees C
thermometer 2 shows 11 degrees C
thermometer 3 shows 15 degrees C
thermometer 4 shows 12 degrees C
NCTM Standard: data analysis & probability 3.1
|
The GLOBE protocol tells you to take the 1st soil temp measurement
at 2 minutes and then repeat the measurements at 1 minute intervals
until consecutive reading are 0.5 - 1.0 degrees C. How long did
it take for the thermometer to accurately record the soil temperature?
temp at 2 min = 14.5 degrees C
temp at 3 min = 15.6 degrees C
temp at 4 min = 15.9 degrees C
temp at 5 min = 16.0 degrees C
NCTM Standard: data analysis & probability 3.1
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The GLOBE protocol tells you to reset the thermometer if the difference
between measuring thermometer and calibrating thermometer is >
2 degrees C. What range of percent error does this represent if
the calibrating thermometer shows 15.8 degrees C? 14.7 degrees C?
NCTM Standard: data analysis & probability 3.1, 3.2, 3.4
The GLOBE protocol tells you to repeat temp measurements at 1 minute
intervals until consecutive reading are 0.5 - 1.0ÕC. What is the
acceptable range of percent error if the initial temperature reading
is 15.8 degrees C?
NCTM Standard: data analysis & probability 3.1, 3.4
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soil
moisture
|
GLOBE students recorded the following measurements:
weight of empty can = 220 grams
weight of can + wet soil = 420 grams
weight of can + dry soil = 400 grams
Calculate the net soil weight.
Calculate the dry soil weight.
Calculate the amount of water.
Calculate soil water content.
NCTM Standard: numbers & operations 2.1, 2.2
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Write an equation that describes how to calculate net soil weight
(X); dry soil weight (Y); amount of water and soil water content
(Z).
NCTM Standard: algebra 2.3
A = weight of empty can (219.5 grams)
B = weight of can + wet soil (422.7 grams)
C = weight of can + dry soil (398.2 grams)
Calculate the net soil weight.
Calculate the dry soil weight.
Calculate the amount of water.
Calculate soil water content.
NCTM Standard: numbers & operations 2.1
|
Write an equation that describes how to calculate soil water content
(amt.H2O).
NCTM Standard: algebra 2.2, 2.3
W1 = weight of empty can (219.5 grams)
W2 = net weight (before drying) (422.7 grams)
W3 = net weight (after drying) (398.2 grams)
Calculate the soil water content for the above sample:
NCTM Standard: numbers & operations 2.1
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