What is soil?

Soil is a natural body consisting of layers (horizons) that are primarily composed of minerals which differ from their parent materials in their texture, structure, consistency, color, chemical, biological and other characteristics. Soil relates to the earth as a system.

What to Soil Scientists Do?

Soil scientists work for federal and state governments, universities, and the private sector. The job of a soil scientist includes collection of soil data, consultation, investigation, evaluation, interpretation, planning or inspection relating to soil science. This career includes many different assignments and involves making recommendations about many resource areas.
http://soils.usda.gov/education/facts/careers.html