Investigate the Earth—soils, oceans, atmosphere—and its history. Geologists can forecast the weather, work in land-use and planning, problem-solve for our resources, or explore extra-terrestrial spheres and other solar systems. The great outdoors is your lab. Some specialties: mineralogy, petrology, structural geology, geochemistry, geophysics and seismology. Traditionally, this job hasn't quite been associated with a hefty paycheck. Still, as we propel further into our limited resources, geologists and geoscientists become the caretakers of our planet—and more and more valuable every day.