Describe the main types of weathering and explain the role of temperature in physical and chemical weathering.

Here's the solution for question 1(a):

a)

i) Three major types of weathering are:

• Physical weathering (also known as mechanical weathering)
• Chemical weathering
• Biological weathering

ii) Temperature plays a significant role in both physical and chemical weathering of rocks.

• In physical weathering, daily and seasonal temperature fluctuations cause rocks to expand when heated and contract when cooled. Repeated cycles of expansion and contraction create stress within the rock, leading to cracks and eventual fragmentation. This process is known as thermal stress or exfoliation. Additionally, in cold climates, water seeps into rock cracks and freezes. As water turns to ice, it expands, exerting pressure that widens the cracks and breaks the rock apart (known as freeze-thaw weathering).
• In chemical weathering, higher temperatures generally increase the rate of chemical reactions (such as oxidation, hydrolysis, and carbonation) that dissolve or alter rock minerals, making them more susceptible to breakdown.