What is the difference between natural and human sciences?

The difference is between what is being studied and how the subjects are studied.

The natural sciences study the natural or physical world.

The human sciences study humans and their interactions with the world.

In general, the natural sciences have more definite quantitative data, whereas the data for human sciences are more variable and are easily biased.

The natural sciences include physics, chemistry, biology and earth sciences.

The human sciences include anthropology, psychology, political sciences, economics, etc.