Answer:
-People can cause incidents by directly or indirectly taking action to the named party/object. Ex: hurting/maiming/killing/destroying objects or people or animals.
-Equipment can malfunction and kill or severely hurt/destroy something or someone. Ex: brakes on a car that failed.
-Material can cause incidents by mixing in with the wrong equipment or causing harm to the named party. Ex: plastic mixing in with water recyclers can cause extensive damage to filters.
- The environment can cause incidents and lots of harm to people or structures near toxic places. Ex: living next to a mine can cause various diseases and structural damage.
Hope this helped