How can human activities increase biological or mechanical weathering?

Correct answer: Mining and excavation expose and weaken rocks

The direct answer is A: mining and excavation expose and weaken rocks. Weathering means the breakdown or alteration of rocks at or near Earth’s surface. Human beings can increase it by cutting hills, digging mines, making roads, removing vegetation, and exposing fresh rock surfaces. The reasoning is: excavation removes soil or covering material; the newly exposed rock meets water, air, temperature changes, salts, and organisms; cracks can widen; roots may enter cracks; therefore biological and mechanical weathering become easier. Option A is correct because mining and construction physically disturb rocks and expose them to weathering agents. Option B is wrong because farming does not stop Earth’s rotation; that claim is unrelated and physically unrealistic. Farming can sometimes increase erosion or expose soil, but it cannot stop planetary rotation. Option C is wrong because buildings do not make rocks invisible; construction may cover some surfaces but often involves cutting, drilling, and exposing others. Option D is wrong because roads do not always stop weathering. Road cutting, vibration, drainage changes, and exposed surfaces can increase weathering. Remember that humans can act as geomorphic agents: their activities change landforms and the conditions affecting rocks.