Why is geothermal energy not always a renewable energy source?

Yes, Geothermal Energy can not be always Renewable. Why? That is important. As Earth Core keeps its temperature always constant around the clock and calander. So as long as we are using normal Under Earth Temeprature, then we are using renewable Energy. However, in some countries, there are extensive Volcanos those provide additional Energy. In those areas, this energy is used as Geothermal Energy and these Volcanos are subject to depletion over the scale of time. And there is not  certanity that these volcanos would be revived or not. Therefore, such Geothermal Energy can't be graded as Renewable Energy.

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apologize i'm not expert on this filed

Hello it's wrong

Because

Renewable energy has the quality of being inexhaustible and generate very little greenhouse gas responsible for global warming .

You've seen wind turbines or solar panels on the roofs of houses ... But do you know of geothermal energy ?.

This technique is already used . It allows to exploit an inexhaustible resource : the heat stored beneath the surface of the Earth!

Unlike fossil fuels , geothermal energy is in all the basements and in all climates . The cubic meters of hot water in the groundwater reserves will not disappear because of geothermal operations. On the contrary, the amount of water will be renewed by natural runoff ; The heat comes to % mineral lode .

We can actually Implement that the Géothermal  is a renewable energy.

Because you are depending on the internal water that is coming from underground and based on the location ( if it rains a lot, if there is a sea or a river that internal water depends on). Also, we need to consider the amount of use of the water in the geothermal plants to see if the source used is renewable or not

I apologize this is not my specialist

Geothermal Energy is not always renewable energy source because the over time extraction of heat from earth's crust may cause depletion, resulting to some geothermal wells cool down and run out of water. Hence, Geo-Sciences group are always in the search of areas where possible source of steam.

Because after years of "extraction" the warm is dissipated. So your well will get always colder and colder.