Principle discussion topics are the atmosphere and oceans, weather, climate, environments of earth materials and vegetation, earth processes, land forms and their development.
(Principle discussion topics; are; the atmosphere and oceans, weather, climate, environments of earth materials and vegetation, earth processes, land forms and their development)
Principle discussion topics
are
the atmosphere and oceans, weather, climate, environments of earth materials and vegetation, earth processes, land forms and their development