Non-renewable resources are limited because once used, they are exhausted and cannot be replenished within a short time, taking millions of years to form. NCERT Book Curiosity Science Class 6 Class 6 Science NCERT Chapter 11
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Non-renewable resources are natural resources that cannot be replenished once used, such as fossil fuels (coal, oil, natural gas) and minerals. They are finite and deplete over time with consumption.