Geological and petroleum technicians, whether working in mines and drilling sites around the world or in labs analysing data, assist scientists in identifying spots that suggest the presence of possible resources such as oil and gas, minerals, or metallic ores. Geological and petroleum technicians in the field collect geological data using sophisticated equipment such as seismic sensors. They collect rock and soil samples and collaborate with environmental scientists and technicians to monitor the environmental impact of drilling and mining under the supervision of geologists and engineers. These technicians examine samples in laboratories for evidence of hydrocarbons, useful metals, or precious gemstones. They analyse data, create maps, and write reports that highlight a site's potential for additional investigation or explain the productivity of an existing site. Except while working in the field, most geologists and petroleum technicians work conventional full-time business hours. Fieldwork is done outside in all kinds of weather, sometimes for weeks at a time in isolated locales. Many technicians are employed in mining, oil and gas extraction, and engineering services. An associate's degree or two years of college studies in applied science or scientific-related technologies are often required for jobs in this profession. A bachelor's degree is required for some highly technical positions.