Natural resources are substances that occur naturally in the environment and are used by humans for various purposes. These resources can be classified into renewable and non-renewable resources.
Renewable resources are those that can be replenished or replaced relatively quickly. These include sunlight, wind, water, and forests. They are sustainable and can be used without depleting the Earth's supply.
Non-renewable resources are finite and cannot be replenished within a short period of time. Examples include fossil fuels such as coal, oil, and natural gas, as well as minerals like copper and gold. These resources take millions of years to form and cannot be easily replaced.