which of these indicates that a layer is active
a) pencI icon
b) lock icon
c) eye icon
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eye icon indicates that layer is active
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When the topsoil layer thaws in summer and again freezes in autumn, it is the indication of the active layer. This is due to the permafrost that is present in the upper layer of the soil and influences the temperature. It forms a barrier between the topsoil and the soil that has been frozen below.
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