The nitrogen cycle is essential for maintaining the fertility of soils, supporting plant growth, and sustaining ecosystems.

The carbon cycle is a dynamic and interconnected system that maintains carbon balance in various reservoirs.

The water cycle is a process that regulates the distribution of freshwater on Earth. It is a continuous supply of fresh water for ecosystems.

Fossil fuels are a non-renewable energy sources that are derived from the remains of ancient plants and animals.

Eclipses occur when the Sun, the Moon, or a planet moves into alignment. The most common types are solar and lunar eclipses.