Geology is a branch of Earth science that emphasizes the study of the physical characteristics of the Earth as well as the movement and formation of rocks and other solid features contained therein.

Mexico, officially the United Mexican States, is a federal constitutional republic in North America. Working may require a work visa, which is difficult to get if you want to freelance for a short time. Most of the government-funded universities in major cities (state capital) have short courses on history, gastronomy, and cultural subjects, and most of them are almost free.

Online learning refers to use of electronic media and information and communication technologies (ICT) in education. With online learning one has the flexibility to access their studies at any time and from anywhere they can log on.