Question

define:
1.soil profile
2.weathering
3. humus​

Answer 1

Answer:

Soil profile

A soil horizon is a layer parallel to the soil surface, whose physical, chemical and biological characteristics differ from the layers above and beneath. Horizons are defined in many cases by obvious physical features, mainly colour and texture.

Weathering

Weathering breaks down and loosens the surface minerals of rock so they can be transported away by agents of erosion such as water, wind and ice. There are two types of weathering: mechanical and chemical. Mechanical Weathering. Mechanical weathering is the disintegration of rock into smaller and smaller fragments.

Humus

humus denominates the fraction of soil organic matter that is amorphous and without the "cellular cake structure characteristic of plants, micro-organisms or animals". Humus significantly affects the bulk density of soil and contributes to its retention of moisture and nutrients.

Answer 2

$\huge\bold\blue{Answer}$

↪Soil Profile -

The soil profile is defined as a vertical section of the soil from the ground surface downwards to where the soil meets the underlying rock.

↪weathering -

Weathering is the breakdown of rocks at the Earth's surface, by the action of rainwater, extremes of temperature, and biological activity.

↪ humus -

Humus is dark, organic material that forms in soil when plant and animal matter decays.

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