Explanation

(a) Rock weathering is defined as the process whereby rocks are broken down into tiny pieces to form the soil.

(b) Three processes involved in rock weathering are: (i) Physical weathering/process (ii) Biological weathering/process (iii) Chemical weathering/process

(c) Agents of rock wethering are;

• Water: causes hydration of rocks and minerals.
• Gravity: an agent of physical weathering and causes abrasion.
• ice: in cold regions, ice formation and subsequent thawing, changes the gap size between rock fragments, loosens them and causes weathering.
• acids: acid attack is a common cause of weathering. carbonic acid and sulfuric acid are commonly implicated as agents of chemical weathering.
• salts: crystal formation of salts in the gaps and fissures also causes weathering of rocks.
• winds: can shape and move loose fragments, thus progressively weathering the rocks.
• plants: grow into crack and fissures. The expanding roots, uptake of chemicals and release of chemicals into rocks causes weathering.
• animals: burrow animals break down rocks, other animals use other means to cause weathering.
• temperature changes: heating and cooling enhances weathering.
• pressure changes
• gases: such as carbon dioxide, oxygen, sulfur oxide, etc. causes acidification or oxidation of rocks.
• microorganisms: break down, acidify and chemically attack soil and rocks and causes weathering.

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