Which type of mass movement makes pattern of wrinkles, or terraces, on hillsides

Idon’t understand this page, can someone ?

Five students had to answer the question how are elements arranged in a periodic tabledamon: i think the elements are arranged by increasing massflo: i think the elements are arranged according to their properties sienna: i think the elements are arranged by when their discovers kyle: i think the elements are arranged according to how common they areglenda: i don't agree with any of themwho is right

Which element would mostly likely have an electron affinity measuring closest to zero