5. Because of rain and oxygen, if a set of tools is left outdoors in the rain for a long time, it will rust.
6. Yes, I believe it is possible for any of the earth materials scenes to be affected by both mechanical and Chemical weathering, but I am more positive about #5.
Answer:
Secondary Succession is when an ecosystem dies then comes back after x time. While people expanding and growing across the planet, ecosystems are getting smaller and smaller. Grass growing through the cracks of a sidewalk is Secondary Succession. Secondary Succession takes a shorter time than Primary Succession, Primary Succession takes thousands of years while Secondary Succession takes a few hundred years.
Explanation: