Since Geology is an applied science, you need to undergo a systematic learning of basic science subjects i.e. Physics, Chemistry, Mathematics, Biology, Computer Sc. at Pre-University and Undergraduate level. This will help in learning Geology systematically and effectively.
Having done the course, you may like to do either researches in Geoscience or Job as a Geologist (Petroleum, Mineral Exploration, etc.). Opportunities are plenty !!!
In nowadays Geology becomes an applied science and someone needs to undergo a systematic learning of basic science like, Physics, Chemistry, Mathematics, Biology etc.
After the courses in University a wide-range of oppurtunities for jobs are open (like mineralogy, applied geology, seismology, applied geophysics, paleontology, tectonics, etc,)
I took an alternative path by completing a science foundation program with the open university which included maths for science and a general course which included physics, chemistry, geology and biology, I used this to gain direct entry to 2nd year geology at Durham iniversity
To practice as a geologist minimum you need is a BSc degree with major in geology although MSc Geology is preferred. Geologists are hired by both private and public sectors. In private sector major employers are petroleum (oil and gas), mining and environmental companies.
usually you start with BSc in applied Geosciences which in the first 2 years elaborates a braod basis in all sciences. Depending on what you like best you usually choose one or two specific subjects like Mineralogy, Structurell Geology, Explorationgeology, Mining, Engineering Geology, E&R, Hydrogeologie, Geophysics, Geologic Systemanalyses and so on... You see already there you may discover a braod field. Also there is the possibilty coming from other disciplines to Geology in a Masters programm. Most likely these BSc's are physics, chemistry, mathmatics, informatics, ambience sciences. In a MSc program you specialize usually in one or two subjects. As others mentioned already the field of working opportunities is a broad one. Usually you need to define for yourself in a first row if you want to go industry, public service or sciences but borders between all of them are usually quite permeable. So going to one sector first does not mean you stay there through out working life. So I wish you all the best for your studies!
The above replies are loaded with good advice but look also at the careers in Geology first and choose a university department that fits your skillset.
Geology involves a lot of field work and limited laboratory work. The type and duration of field work will be decided by your specialization or job required skills. You must be ready for this. I have known some students who are put off by field work and have diverted their careers to non geological jobs with a less demanding work load. Put in effort and hard work in your studies. Good luck to you.
there are a lot of interesting answers and hints in the discussion above..........
.......of course mathematics, physics, fracture mechanics, chemistry, numerical models, software applications, etc. etc. are very important skills nowadays, but please don´t forget:
teaching, learning and understanding of Geology and geological processes without extended field experience, lithological and tectonical mapping, evaluation of Schmidt-Projection and the classical petrographical analysis, etc. is not possible...........
call me old fashioned but in my opinion the reduction of the basical education in the field with all the classical methods and techniques could be the wrong way..........
Computerized geological models are a smart possibility for the presentation of interpretations but.............not more..........
A dedicated love to nature, rocks and minerals comes first, then you can study all of these subjects like physics, chemistry, mathematics, biology, geographics, mathematics, computing, geology, field work, laboratory work, and so on ......................!
Geology is a very dynamic science. When everything changes around you can't do topics which are new some 10 years ago. Of course the student can take the basic concepts of lesssons like geology, tectonics , hydrogeology, engineering geopligy, mineralogy,and rocks, geophysics,mine deposits, mathematics, physics, chemistry, oceanography, field experience, data analysis, software applications, energy sources,among others. In these years gas and oil are of primary importance and these two topics must be new lessons in geology departments
Because geology is an applied science....it is an application of all the pure sciences... I agree with all answers especially of Andreas answer because the field work is the core of geology