Erosion that is a slow process, but it constantly changes the features on the surface of the earth.

A．which is

B．although

C．being

D．is

职工因工伤亡事故和其他严重危害职工健康问题的调查处理，（）参加。工会应当向有关部门提出处理意见，并有权要求追究直接负责的主管人员和有关责任人员的责任。