The sun... and the earth's mantle. The surface of the earth is mainly warmed by radiation from the sun - but we also get some heat through the ground - from the molten mantle underneath the Earth' crust.
Source of heat energy that keeps the surface of the Earth warm enough support LIFE
The gravitational pull keeps the Earth's atmosphere close to the surface...
They do. Greenhouse gases in the atmosphere retain heat rising from the surface of the earth and stop it escaping into space. This keeps the earth comfortably warm and has done for thousands of years.
The temperature of the surface of the earth . How warm the earth can get . Xx
Gravity
Sunlight. The warmth rises into the atmosphere where some is trapped by greenhouse gases. These warm gases then warm the earth's surface again.
Rays from the sun shine down to earth.
The greenhouse effect. Greenhouse gases like carbon dioxide and methane trap infrared heat rising from the surface of the earth. This heat warms the atmosphere and also the earth again.
The Earth's gravity keeps our feet firmly on the ground.
Yes, the natural greenhouse effect keeps the earth's atmosphere warm enough for us to live.
Earth's core is warmed by the slow decay of long lived isotopes.
Only the Earth.