Which one of the following types of resource is iron-ore?

Biotic resources available on earth are of two types: Renewable resources and Non-renewable resources.

Renewable resources are those resources that can be replenished after their use. Examples: solar energy, Tidal energy, oxygen, etc.

Non renewable resources are those resources that cannot be replenished easily and take millions of years to replenish. They are important for economic activity. Examples: iron-ore, fossil fuels, etc.