Question

why brown leaves burn easily but Green Leaves do not​

Answer 1

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$\huge\star\underline\mathbb\orange{LEAVES}$

Green Leaves contain moisture whereas dry leaves do not contain moisture, as a result the ignition temperature of Green Leaves is higher than of dry leaves. Due to this reason ,it is difficult to burn a heap of Green Leaves but dry leaves catch fire easily.

Answer 2

because green leaves contain water .this water absorbs the heat of fire . Thus green leaves don't burn