The less resistant rocks, such as limestone, form the lower valleys which are cleared land and farm fields and are purple in this image.
(The less resistant rocks, such as limestone; form; the lower valleys which are cleared land and farm fields and are purple in this image) (the lower valleys; are cleared; land and farm fields) (the lower valleys; are; purple; L:in this image)
The less resistant rocks, such as limestone the lower valleys the lower valleys
form are cleared are
the lower valleys which are cleared land and farm fields and are purple in this image
land and farm fields
purple L:in this image