Please choose the correct answer to the question: Before rock can become soil, it must undergo certain processes. One process in the formation of soil involves plants. How can plants chemically change rocks into soil?

Answer1: They weather rocks with acid. Answer2: They strip the rocks of minerals. Answer3: They break rocks into small pieces. Answer4: They increase the density of the rocks.

Answer format: answer1/answer2/answer3/answer4
Answer: answer1