Changes in the earth and sky Weather changes from day to day and over the seasons. People have always had questions about their world. Science is one way of answering questions and explaining the natural world. Scientists and engineers often work in teams with different things that contribute to the results. Women and men of all ages, backgrounds, and groups engage in a variety of scientific and technological work.
Tools help scientists make better observations, measurements, and equipment for investigations.
Science in Personal and Social Perspectives Personal health Safety and security are basic needs of humans. Safety involves freedom from risk or danger. Changes in environments Changes in environments can be natural or influenced by humans. Some changes are good, some are bad, and some are neither good nor bad. Pollution is a change in the environment that can influence the health, survival, and activities of organisms, including humans.