Why ecological succession will be faster in a r orest devastated by fire than on a bare rock ? Also, compare succession in case of an abandoned land after floods with that on a bare rock?

Explanation

If succession occurs in an area devoid of life, it is termed as primary succession. On the other hand, if succession occurs in an area where natural or man made causes have resulted in destruction but area still has organic matter, then it is termed as secondary succession.
Primary succession on a bare rock is very slow as establishment of new communities is a slow process and formation of soil takes several hundred years. On the other hand, in areas where natural biotic communities have been destroyed e.g, forests after fire or abondened land after floods, succession is faster. It is so because such areas still have soil and sediment rich i norganic matter.