The structure below is used in agriculture. What could be a benefit of this technology?
A. It can create unemployment problems in the farming industry.
B. It can create food using more land than a traditional farm.
C. It can be used to grow food in areas with a shortage of land.
D. It can be used to grow food without sunlight.

they float because they are less dense than the water itself

something denser than water, like a rock, will sink to the bottom

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measuring light intensity

light meters can be used to measure light intensity. the meter is held at the soil surface and pointed in the direction of the maximum light intensity, and then the meter is read.

errors can be made when measuring light intensity by accidentally shading the light meter. the reliability of the results can be checked by taking many samples.