Question

which factor influences both chemical weathering and mechanical weathering?
plants
wind
tectonic plates
iron

Explanation:

To determine the factor influencing both chemical and mechanical weathering, we analyze each option:

• Plants: Roots can physically break rocks (mechanical weathering), and plant acids can chemically react with rocks (chemical weathering).
• Wind: Primarily causes mechanical weathering (e.g., abrasion) and has little direct role in chemical weathering.
• Tectonic plates: Related to geological movements, not direct weathering (weathering is surface - related, tectonics is about plate movement).
• Iron: Involved in chemical weathering (e.g., oxidation) but not mechanical weathering.

So plants affect both types of weathering.

Answer:

plants