I will mark you brainlist! The movement of colored water through the gravel best models -

Answer choices:
A. condensation of water vapor
B. surface runoff of precipitation
C. conservation of water
D. pollution of groundwater

A student sets up the investigation show below.

Iron is a transition metal with multiple oxidation numbers. (answer the following) a. what is the iron (ii) ion? how does it differ from the iron (iii) ion? b. if iron were to bond with oxygen, predict the formula for each oxidation number of iron. c. how would each formula be named?