The atmosphere is warmed by the heat radiating from Earth's surface. This process helps to regulate the planet's temperature and create the conditions necessary for life to thrive.
greenhouse effect
From the sun it goes Mercury, Venus, Earth, Mars, ASTEROID belt, Jupiter, Saturn, Uranus, Neptune, Pluto (although no longer classed as a planet). So the earth is inside the orbit of the asteroid belt.
the liquid materials inside the earth is the magma. Or in another words, the lava which erupts from volcanoes
The Liquid Outer Core.
It is warmed by geothermal energy which is created by RADIOACTIVE DECAY http://en.wikipedia.org/wiki/Geothermal_(geology)
That's because of where each of these processes occur. There is no nuclear fusion inside of Earth. There is probably a small amount of radioactive decay in the Sun, but the power produced by it is insignificant, compared to the huge amount of power produced by nuclear fusion.
The sun
The Earth's core contains many radioactive elements within its core that emit warmth as they decay, keeping the core of the Earth hot and heating it from within. Meanwhile, the sun is a product of the nuclear fusion of hydrogen into helium and its rays warm the Earth's crust from outside.
The atmosphere is warmed by the heat radiating from Earth's surface. This process helps to regulate the planet's temperature and create the conditions necessary for life to thrive.
"The earth is warmed by the sun through radiation"
Earth's core is warmed by the slow decay of long lived isotopes.
built their homes
secured their food
The troposphere is the layer of Earth's atmosphere where air is most likely warmed by conduction. This is the lowest layer of the atmosphere where weather events occur, and conduction is the main mechanism through which heat is transferred near the Earth's surface.
The lower atmosphere, known as the troposphere, is warmed by heat from Earth's surface. This warming is due to the absorption of outgoing radiation by greenhouse gases such as carbon dioxide and water vapor, which trap heat in the atmosphere.
Secured their food