Why can vegetation decline when topsoil is removed by mining?

Correct answer: Because topsoil gives nutrients and root support

The direct answer is A: topsoil gives nutrients and root support. Topsoil is the upper, relatively fertile layer of soil. It contains humus, minerals, air spaces, water and many useful organisms. Plant roots usually grow in or depend on this layer, so it provides both food materials and physical support. The reasoning is: mining removes or disturbs the upper layer → nutrients and organic matter are lost → roots have less suitable material and support → plant growth and vegetation decline. Option A is correct because it states both main reasons. Option B is wrong because mining generally damages land and does not increase rainfall; rainfall depends mainly on atmospheric and climatic conditions. Option C is wrong because most plants need soil for water, minerals and anchorage, although some plants may grow in unusual media. Option D is wrong because plants do not eat stones; they absorb dissolved water and mineral nutrients through their roots. The accurate exam link is mining → removal of topsoil → land degradation → reduced vegetation. Restoration may require replacing soil and replanting.