Please help me please please

C) Erosion

D) Iron, Magnesium and Sodium Ions

E) Mountains (If I am wrong please comment.)

Explanation:

C) In the long run, cutting of trees on slopes leads to a gradual decrease in mass stability as a result of the decay of roots which previously acted as tensile reinforcements in the slope. Root decay can also lead to the formation of pipes in a slopes which promote internal or seepage erosion.

D) NASA's Mars Atmosphere and Volatile Evolution (MAVEN) orbiter has spotted iron, magnesium and sodium ions

E) Mountains

answer; cultural trait;

productive most commonly means: achieving or producing a significant amount or result.

explanation:

productive can also mean:

these depend on how the word productive is used. most likely productive will mean   achieving or producing a significant amount or result.