Question

The four main components of soil are

(a) tiny pieces of rock, humus, air and sand
(b) humus, clay, water and salts
(c) air, water, tiny pieces of rock and manure
(d) tiny pieces of rock, air water and humus

Answer 1

(b) humus, clay, water and salts

The four main components of soil are humus, clay, water and salts.