Which type of sentence is this? Vivian, whose fair complexion makes her prone to sunburns, always wears sunscreen for protection against the sun's harmful ultraviolet rays.

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.