Given a scientific question, generate a correct answer to it.

Ex Input:
What consists of four major components: inorganic mineral matter, organic matter, water and air, and living matter?

Ex Output:
soil

Ex Input:
Carboxylic acids have an acidic hydrogen atom, but esters do not. what do esters have in place of an acidic hydrogen atom?

Ex Output:
hydrocarbon group

Ex Input:
Soil forms where land areas are what?

Ex Output:
flat