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1: Active solar heating system 2: Soil 3: Feeder 4: Community 5: Carbon 6: Fishery 7: Range 8: Lead 9: Contamination 10: Water 11: Condition 12: Uptake 13: Current 14: Electricity 15: Atom 16: Conservation 17: Change 18: Process 19: Environment 20: Human (As of 13:42)
A 40-hex is the landscape description hexagon that is established on each of the grid points in the EMAP grid. Actual size of these hexagons is 634.5/16 = 39.7 km2.
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