How to do this question:
do not _ the pages of a book. use a bookmark instead.

Do not fold the pages of a book. Use a bookmark instead.

Example support i believe : )

To form soil, the two processes which must occur are erosion and weathering, so the correct answer is "soil formation is a continuous presses, but also one which takes a long time, it can sometimes take more than five hundred years for 1cm of soil to form.