A student made a model of a river in a sandbox. A pile of sand represents soil and bits of rock in the riverbed. Water

pouring from a hose represents river water as it flows

downhill.

Which two characteristics are limitations of the student's model?

Four statements about the development of the atomic model are shown below. a: electrons have wavelike properties. b: atoms have small, negatively charged particles. c. the center of an atom is a small, dense nucleus. d: atoms are hard, indivisible spheres. which order of statements represents the historical development of the atomic model? c-d-a-b c-d-b-a d— в-а — с d-b-c-a