- The four main systems of the Earth are
Ageology, meteorology, oceanography, and chemistry.
Bgeosphere, atmosphere, hydrosphere, and aerosphere.
Caromatherapy, biology, chemistry, and physical properties.
Dgeosphere, atmosphere, hydrosphere, and biosphere.
Ageology, meteorology, oceanography, and chemistry.
Bgeosphere, atmosphere, hydrosphere, and aerosphere.
Caromatherapy, biology, chemistry, and physical properties.
Dgeosphere, atmosphere, hydrosphere, and biosphere.