There isn't a universally agreed upon "four branches" of science. Science is a vast and interconnected field, and different categorizations exist. Here's a breakdown of common groupings:

1. Natural Sciences:

* Biology: The study of life.

* Chemistry: The study of matter and its properties.

* Physics: The study of the fundamental laws of the universe.

* Earth Science: The study of the Earth's systems, including geology, meteorology, and oceanography.

* Astronomy: The study of celestial objects and phenomena.

2. Social Sciences:

* Psychology: The study of the human mind and behavior.

* Sociology: The study of human society and social interactions.

* Anthropology: The study of human cultures and origins.

* Economics: The study of production, distribution, and consumption of goods and services.

* Political Science: The study of government, power, and politics.

3. Formal Sciences:

* Mathematics: The study of abstract structures, patterns, and relationships.

* Logic: The study of valid reasoning and argumentation.

* Computer Science: The study of computation and information processing.

4. Applied Sciences:

* Engineering: The application of scientific principles to solve practical problems.

* Medicine: The application of scientific knowledge to diagnose, treat, and prevent diseases.

* Agriculture: The application of scientific methods to improve crop production and livestock management.

Important Note: These categories are not absolute and there's significant overlap between them. For example, biophysics combines biology and physics, and astrophysics combines astronomy and physics.

It's also important to remember that this is just a general overview. Within each of these categories, there are countless subfields and specialties.