Energy used since long time ago is a energy production system where the energy is joined with the new resources and alll of that turns into electric energy!<span />
I think it is carbohydrates
At the Earth's surface, rocks usually break quite quickly, but deeper in the crust, where temperatures and pressures are higher, rocks are more likely to deform plastically. Sudden stress, such as a hit with a hammer, is more likely to make a rock break. Stress applied over time often leads to plastic deformation. Hope this helps. ヅ
