Question

Dumping the waste material made up of metals and non metals leads to environmental pollution

Answer 1

dumping the waste materials like metals nonmetals and water pollutants make the soil infertile which leads to the pollution and excess pollution leads to the excess contamination in the environment.
when you put some toxic materials or metals and nonmetals then these substances do not biodegrade order degrade in the soil and become a part of waste and leads to contamination of soil which makes this oil and healthy and polluted and leads to soil pollution.
to minimise such pollution we should use biodegradable things. and we should say your country by getting it polluted.