Earth's Core

[hrherle]

My query is that if the Gravity of the Earth will remain same for years to come, will the Earth's core ultimately cool down or the Gravity and the Pressure of Earth's Crust will keep it hot and molten for ever.It seems for every new layer of lava deposited on the Photosphere by Volcanic Activites or other ones, the previous layers are pushed toards the Earth's Core and the cycle repeats itself. :-?

[Peter B]

My query is that if the Gravity of the Earth will remain same for years to come, will the Earth's core ultimately cool down or the Gravity and the Pressure of Earth's Crust will keep it hot and molten for ever.It seems for every new layer of lava deposited on the Photosphere by Volcanic Activites or other ones, the previous layers are pushed toards the Earth's Core and the cycle repeats itself. :-?

One of the major factors for the heat in the Earth's core is the decay of radioactive isotopes. Eventually, all the isotopes will decay to stable elements, and no further heating will be provided from this source. However, this is a long way off.

Can I clarify what you mean when you talk about lava being deposited on the photosphere, please? The photosphere is a layer on the Sun.

Finally, from a Thermodynamic point of view, the process you describe can't last for ever. When magma is deposited on the surface of the Earth as lava, it cools and becomes solid. This releases heat into the atmosphere which is eventually radiated into space, and thus permanently lost to the Earth. Following this process to a logical conclusion, the Earth must eventually run out of Earth-produced energy.

Can someone who knows a little bit more about this check that what I've said is okay, please? :-)

[John Kierein]

There is an alternate, minority view that I hold. That is that gravity is caused by a push of outside highly penetrating radiation that pushes everything together. See the book "Pushing Gravity". This continuous energy input to masses causes them to heat. Also some of the energy is converted to new mass at the core. So the earth is expanding and heating.

It's interesting that the Earth's core rotates faster than the surface.

[eburacum45]

There is an alternate, minority view that I hold. That is that gravity is caused by a push of outside highly penetrating radiation that pushes everything together. See the book "Pushing Gravity".

This is a venerable idea, and was discussed by theologians in medieval times IIRC.
At that time the entities doing the pushing were regarded as spirits or angels.

I tend to think of these theories under the heading 'Gravity doesn't suck, it blows.'

But other (mainstream) theories expect the Earth (and all bodies) to cool down eventually.