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Soil-Plant-Air Continuum Student Workbook

Water is essential to life, and it continuously moves from the soil to the plant to the air and back to the soil in a system known as the soil-plant-air continuum or SPAC. This course shows how water moves in the hydrologic cycle, and is used by plants for transpiration and photosynthesis. Energy from the sun enables the plant to store energy for use by other living beings. Oxygen and carbon are also in a continuous cycle. This module shows how the systems all work together in a continuum essential to life.
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