Sunlight
The most reliable source of energy for life on Earth is the Sun. Solar energy provides the necessary light and heat for photosynthesis, which is the process by which plants and other organisms convert sunlight into energy. This energy powers most ecosystems and is essential for sustaining life on our planet.
Radiation from the Sun-it's been going for a long time!
Sunlight. It happened every day and was the source of all energy.
Sunlight
The sun
Sunlight
The sun
the sun
It's not the most reliable source.
The fundamental source of energy on Earth is the sun. Solar energy is the primary driver of most natural processes and life on our planet.
sunlight
The water provided by one's city or region is the most reliable source of dietary flouride.