Earth science is a broad field encompassing the study of the Earth's physical systems and its history. The main areas of earth science are:

* Geology: The study of the Earth's solid, non-living components, including rocks, minerals, and landforms.

* Oceanography: The study of the Earth's oceans, including their physical, chemical, and biological properties.

* Meteorology: The study of the Earth's atmosphere and weather patterns.

* Climatology: The study of the Earth's climate and climate change.

* Astronomy: The study of celestial objects and phenomena beyond the Earth's atmosphere.

While astronomy is a crucial science, it's not considered a main area of *earth* science. It focuses on space and celestial bodies beyond our planet.