Radioactive Decay
Gravity is the force that causes objects to move toward the center of the earth. This force is proportional to the mass of the object and the mass of the earth, and it decreases with distance from the center of the earth.
The heat at the center of the Earth comes from several sources: residual heat from the planet's formation, heat produced by radioactive decay of elements like uranium and thorium, and heat generated by the Earth's inner core as it solidifies and releases latent heat.
Heat rising from within the Earth causes the Earth's tectonic plates to move. The constant rising and sinking of heat are called convection currents.
The center of the earth is hot because of heat retained from when the planet formed, frictional heating and heat that comes from the decay of radioactive elements.
As we get closer to the center of the earth, the gravity of earth increases and the heat too increases...thats what i think.
The very center
No, you can not get to the center of the earth. The core of the earth, which is the center of the earth, is way to hot. It would be like standing on the sun, but though the core of the earth is EXTREMELY hot, it can not compare to the heat of the sun
Lava is created/stored at the center of the earth. The center of the earth is very warm because the earth absorbs some( i believe 5%) of the heat give off by the sun.
Gravity is the natural force that causes an object to move toward the center of Earth. This force is proportional to the mass of the object and the mass of Earth, and inversely proportional to the distance between the object and the Earth's center.
Friction
Heat from the Earth's core.
No, there is no air in the center of the Earth. The center of the Earth is composed of extremely high-pressure solid and liquid metals, predominantly iron and nickel, due to the intense heat and pressure.