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The geologist's work includes locating and obtaining physical data and material. This may necessitate the drilling of deep holes to obtain samples, the collection and examination of the materials found on or under the earth's surface, or the use of instruments to measure the earth's gravity and magnetic field. Some geologists may spend three to six months of each year in fieldwork. In laboratory work, geologists carry out studies based on field research. Sometimes working under controlled temperatures or pressures, geologists analyze the chemical and physical properties of geological specimens, such as rock, fossil remains, and soil. Once the data is analyzed and the studies are completed, geologists and geological technicians write reports based on their research.