People are attempting to conserve natural resources, such as oil, gold, and aquifers because they are non-renewable resources. Why can't these resources be replaced?

Natural resources are the resources that are available in the nature. There is no human involvement in the production or manufacture of the natural resources. These resources helps in adding capital and growth to the development of the country. Natural resources are found in abundance but they are non-renewable resources. This means that it takes millions of years for their formation. Once exhausted, their replacement would became very difficult. Conversation of the natural resources has been one of the global action. Developed nations are equipped to find ways by which natural resources can be saved and used in a way that they do not extinguish. Many alternative methods and techniques have been adopted to preserve them. Natural resources like oil, gold and coal are performed after going through a process of many years. Hence, there replacement becomes very challenging and difficult respectively.

geosphere and hydrosphere.

this is because the geosphere has to do with geological events, while the hydrosphere controls all water on earth.