Which of the following is not an example of physical weathering?

wind blowing and eroding sandstone
acid rain dissolving limestone
ocean waves crashing against basalt
a river carving out a canyon through bedrock

Acid rain dissolving limestone is not an example of physical weathering. The correct option among all the options that are given in the question is the second option. Acid rain dissolving limestone is an example of chemical weathering. The acid rain reacts with the limestone to dissolve it. I hope it helps.

True as the lakes are a marine body. also there's no difference in lake and ocean except for the size.