There are several earth created pure energy sources. The most well known include solar energy, hydroelectricity, wave power, wind energy, and geothermal energy.
Geothermal energy is created from the Earth's heat. This renewable energy source harnesses heat from beneath the Earth's surface to generate electricity or provide direct heating.
The sun is the main source of energy on earth.
The primary is the sun
the sun is the main source of energy of the earth the sun is the main source of energy of the earth the sun is the main source of energy of the earth
Sunlight is the main energy source for life on earth.
It isn't clear what "building blocks" you are talking about.
sun
the sun
the sun
For us here on Earth, the prime source of energy is the Sun.
solar energy
We get most of our energy from sunlight.