It is difficult to burn a heap of green leaves but dry leaves catch fire easily. Explain.
It is difficult to burn a heap of green leaves but dry leaves catches fire easily because green leaves contains a lot of water. That water cools the leaves and the temperature becomes below its ignition temperature. This prevents the burning of green leaves. But in dry leaves, there is no water present. So, as the temperature raised above the ignition temperature, the leaves catches fire easily.
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