Question

in which of the following stages of soil formations does humus get formed by break down of plants or animals remains ?
A ) Stage 1
B ) stage 2
C ) Stage 3
D ) Stage 4 ​

Answer 1

Answer:

) It breaks down rocks to form soils.

b) It breaks up minerals in rocks to release important nutrients into the soil.

The breaking down of the rock materials occurs in place with little or no movement.

What are the 2 basic types of weathering?

a) Mechanical or physical weathering and

b) Chemical weathering

Mechanical weathering: is the physical breakdown of rocks into smaller pieces and fragments. It does not alter the chemical composition of the original rock.

What are the causes of Mechanical Weathering?

a) Frequent temperature changes (exfoliation)

b) Freezing and melting of liquid water (frost wedge)

c) Roots of plants break up rocks

d) Burrowing the ground by such animals as rabbits

Mechanical weathering is common is Deserts and Tundra climates.

Chemical Weathering: involves the decay of rocks exposed to moisture and air. It occurs in a variety of chemical reactions.

Chemical weathering results in changes in minerals that make up the rocks

Types of Chemical Weathering

a) Oxidation: a process in which iron, a common element in many rocks, combine with moisture and oxygen to form iron oxide or rust.

b) Solution: water enters rock substances to dissolve them e.g. sodium chloride (salt) & calcium sulfate (gypsum).

Chemical weathering occurs faster in hot wet climates such as Rainforests

Explanation:

It is the process by which rocks on the earth's surface are broken down into pieces such as boulders, pebbles, sand, grains, silt and clay.

Answer 2

it's stage 2..........