Question

Why does physical weathering typically increase the rate and magnitude of chemical weathering?

1) physical weathering requires abundant water, as does chemical weathering
2) physical weathering produces fresh surfaces of rock for chemical weathering to attack
3) physical weathering makes minerals more soluble in water
4) physical weathering generates heat, which increases the rate of chemical weathering reactions

Answer 1

Physical weathering increases the rate and magnitude of chemical weathering due to factors such as the production of fresh rock surfaces, increased solubility of minerals, and the generation of heat that enhances chemical reactions.

Step-by-step explanation:

Physical weathering typically increases the rate and magnitude of chemical weathering for several reasons:

1. Physical weathering produces fresh surfaces of rock for chemical weathering to attack. When rocks are broken down into smaller pieces through physical weathering processes such as frost action or root wedging, it exposes more surface area of the rock to chemical weathering agents like water or acids.
2. Physical weathering makes minerals more soluble in water. The fractures and cracks produced during physical weathering can provide pathways for water to penetrate deeper into the rock, allowing for increased chemical reactions and the dissolution of minerals.
3. Physical weathering generates heat, which increases the rate of chemical weathering reactions. When rocks are subjected to physical weathering processes such as abrasion or thermal expansion and contraction, it can create heat that accelerates chemical reactions, leading to faster chemical weathering.