When a strong earthquake occurs on the ocean floor rather than on land,
a tremendous force is exerted on the seawater.
我想请问,a tremendous force exert 不是主动吗(这股力量主动影响海水)?
为何这句会用被动态?
感谢各位!

这股力量是被施加的 a tremendous force is exerted (bythe earthquake) on...