Is it living indicator or non-living indicators. They use satellites to measure temperature of the sea surface and the amount of snow and ice cover.
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Card 17
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Is it living indicator or non-living indicators. Automatic weather stations tell us the atmospheric temperature.
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Card 18
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Is it living indicator or non-living indicators. They measure rainfall using rain gauges.
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Card 19
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Is it living indicator or non-living indicators. They use dissolved oxygen meters (concentration of dissolved oxygen) to discover the level of water pollution.
