Final answer:
The ultimate source of energy for the Earth is the Sun.
Step-by-step explanation:
The ultimate source of energy for the Earth is the Sun.
The Sun emits light (electromagnetic radiation), which creates wind, powers the water cycle, and enables photosynthesis. Plants and other photosynthetic organisms utilize solar energy to grow and create biomass. Over millions of years, biomass can transform into energy-rich fossil fuels.
Renewable energy sources such as solar, wind, and biomass energy are replenished within human lifespans, while non-renewable energy sources like nuclear energy and fossil fuels are finite.