Question

To classify soil by type, soil scientists...

a. measure the amount of humus.
b. measure the proportions of particles of different sizes.
c. measure the depth of the three soil horizons.
d. none of these.

Answer 1

`\bold{\huge{\blue{\underline{\boxed{ Answer}}}}}`

To classify soil by type, soil scientist measure the depth of the three soil horizons.

Hence, Option 3 is correct.