Natural science is a very broad field with many specializations. Here are some of the main areas of specialization in natural science:
- Physics: This is the study of matter and energy, their interactions, and the laws that govern them. Specializations within physics include particle physics, astrophysics, quantum mechanics, condensed matter physics, and nuclear physics.
- Chemistry: This is the study of the composition, properties, and behavior of matter. Specializations within chemistry include organic chemistry, inorganic chemistry, physical chemistry, analytical chemistry, biochemistry, and environmental chemistry.
- Biology: This is the study of living organisms and their interactions with each other and their environment. Specializations within biology include molecular biology, genetics, ecology, evolutionary biology, microbiology, zoology, and botany.
- Earth Science: This is the study of the Earth and its geology, meteorology, oceanography, and astronomy. Specializations within Earth science include seismology, volcanology, climatology, paleontology, and planetary science.
- Astronomy: This is the study of celestial objects and their properties, motions, and interactions. Specializations within astronomy include planetary science, cosmology, astrophysics, and astrobiology.
- Environmental Science: This is the study of the environment, including its physical, chemical, and biological components, and how they interact with each other. Specializations within environmental science include ecology, conservation biology, atmospheric science, and marine science.

Physics is a very broad field with many specializations. Here are some of the main areas of specialization in physics:
- Astrophysics: This is the study of the physical properties and behavior of celestial objects such as stars, planets, galaxies, and black holes.
- Particle Physics: This is the study of the properties and behavior of subatomic particles, such as protons, neutrons, and electrons, and the forces that govern their interactions.
- Condensed Matter Physics: This is the study of the physical properties and behavior of materials in a condensed state, such as solids and liquids.
- Quantum Mechanics: This is the study of the behavior of matter and energy at a very small scale, such as the behavior of particles and waves on the atomic and subatomic level.
- Optics: This is the study of the behavior of light and its interactions with matter.
- High Energy Physics: This is the study of the properties and behavior of particles and radiation at very high energies, often involving particle accelerators.
- Nuclear Physics: This is the study of the behavior and properties of atomic nuclei and the forces that hold them together.
- Plasma Physics: This is the study of the behavior of ionized gases and their interactions with magnetic and electric fields.
- Biophysics: This is the study of the application of physics to biological systems, including the study of biological processes, biophysical techniques, and medical physics

Chemistry is a very broad field with many specializations. Here are some of the main areas of specialization in chemistry:
- Organic Chemistry: This is the study of the structure, properties, and reactions of organic compounds, which are compounds that contain carbon atoms.
- Inorganic Chemistry: This is the study of the structure, properties, and reactions of inorganic compounds, which are compounds that do not contain carbon atoms.
- Physical Chemistry: This is the study of the fundamental physical principles that govern chemical systems, including thermodynamics, quantum mechanics, and statistical mechanics.
- Analytical Chemistry: This is the study of the separation, identification, and quantification of chemical compounds in complex mixtures.
- Biochemistry: This is the study of the chemistry of living systems, including the structure and function of biological macromolecules such as proteins, nucleic acids, and lipids.
- Environmental Chemistry: This is the study of the behavior and fate of chemicals in the environment, including the study of atmospheric, aquatic, and soil chemistry.
- Materials Science: This is the study of the properties, synthesis, and behavior of materials, including polymers, metals, and ceramics.
- Polymer Chemistry: This is the study of the properties, synthesis, and behavior of polymers, which are large molecules made up of repeating subunits.
- Medicinal Chemistry: This is the study of the design, synthesis, and evaluation of chemical compounds for use in pharmaceuticals.

Biology is a very broad field with many specializations. Here are some of the main areas of specialization in biology:
- Molecular Biology: This is the study of the structure and function of biological molecules, such as DNA, RNA, and proteins, and the processes by which they interact and function within cells.
- Genetics: This is the study of inheritance and the variation of traits from generation to generation, including the study of genes, chromosomes, and heredity.
- Microbiology: This is the study of microorganisms, including bacteria, viruses, fungi, and protozoa, and their interactions with other organisms and the environment.
- Ecology: This is the study of the interactions between organisms and their environment, including the study of ecosystems, populations, and communities.
- Evolutionary Biology: This is the study of the processes of biological evolution, including the study of natural selection, adaptation, and the history of life on Earth.
- Zoology: This is the study of animals, including their behavior, physiology, and morphology.
- Botany: This is the study of plants, including their structure, physiology, and ecology.
- Biotechnology: This is the application of biological systems and organisms to develop new technologies and products.
- Neurobiology: This is the study of the nervous system, including the structure, function, and development of the brain and nervous system.

Earth science is a very broad field with many specializations. Here are some of the main areas of specialization in earth science:
- Geology: This is the study of the solid Earth, including its composition, structure, and processes. Specializations within geology include mineralogy, petrology, structural geology, geomorphology, and stratigraphy.
- Meteorology: This is the study of the atmosphere and its processes, including weather patterns, atmospheric dynamics, and climate. Specializations within meteorology include synoptic meteorology, climatology, and atmospheric chemistry.
- Oceanography: This is the study of the oceans and their processes, including physical, chemical, biological, and geological oceanography.
- Paleontology: This is the study of the history of life on Earth, including the study of fossils, the evolution of species, and the relationships between organisms.
- Environmental Science: This is the study of the interactions between the environment and human activity, including the study of pollution, climate change, and resource management.
- Hydrology: This is the study of the movement, distribution, and quality of water on Earth, including the study of groundwater, surface water, and water resources.
- Seismology: This is the study of earthquakes and the seismic waves they produce, including the study of the Earth’s interior structure.
- Volcanology: This is the study of volcanic activity, including the study of the causes of eruptions, the types of volcanic eruptions, and their impact on the environment.

Astronomy is a very broad field with many specializations. Here are some of the main areas of specialization in astronomy:
- Astrophysics: This is the study of the physical properties and behavior of celestial objects such as stars, planets, galaxies, and black holes.
- Cosmology: This is the study of the origin, evolution, and structure of the universe, including the study of the Big Bang theory, dark matter, and dark energy.
- Planetary Science: This is the study of the properties and behavior of planets, moons, and other objects in our solar system.
- Stellar Astronomy: This is the study of the physical properties and behavior of stars, including their formation, evolution, and death.
- Exoplanet Astronomy: This is the study of planets outside of our solar system, including the search for exoplanets and the characterization of their properties and environments.
- Galactic Astronomy: This is the study of the structure, evolution, and properties of galaxies, including the Milky Way and other galaxies.
- High-Energy Astrophysics: This is the study of the behavior and properties of objects in the universe that emit high-energy radiation, including black holes, neutron stars, and supernovae.
- Astrobiology: This is the study of the possibility of life beyond Earth, including the search for extraterrestrial life and the study of the conditions required for life to exist.

Environmental science is a very broad field with many specializations. Here are some of the main areas of specialization in environmental science:
- Conservation Biology: This is the study of the protection and preservation of biodiversity and the ecosystems that support it.
- Environmental Chemistry: This is the study of the behavior and fate of chemicals in the environment, including the study of atmospheric, aquatic, and soil chemistry.
- Environmental Engineering: This is the application of engineering principles to the design and management of systems and technologies that minimize environmental impacts.
- Environmental Health: This is the study of the effects of environmental factors on human health, including the study of air and water pollution, toxicology, and epidemiology.
- Environmental Policy: This is the study of the laws, regulations, and policies that govern human interactions with the environment, including the study of environmental economics and policy analysis.
- Geographical Information Science: This is the study of the use of spatial data and geographic information systems to understand and manage environmental systems.
- Hydrology: This is the study of the movement, distribution, and quality of water on Earth, including the study of groundwater, surface water, and water resources.
- Soil Science: This is the study of the properties, behavior, and management of soils, including the study of soil formation, erosion, and nutrient cycling.