Question

burning of a heap of green leaves is difficult , but dry leaves catch the fire easily why

Answer 1

because heap of green leaves is difficult to burn because it contains water which make it difficult of fire/heat to generate whereas dry leaves catch fire as there is no water in them

Answer 2

Answer:

It is difficult to burn a heap of green leaves but dry leaves catch fire easily because green leaves have moisture present in them. Hence the heat gets absorbed by water to provide energy to evaporate. But, the dry leaves have no moisture and hence the heat is not lost. That is why it catches fire easily.