In a different experiment, leaves turn yellow when a plant is kept in the dark. The leaves on a similar plant kept in the light remain green. From this, one might suppose that these is a link between the amount of light a plant receives and the colour of its leaves. A piece of clear plexiglass can then be placed on the lawn to see if pressure alone will cause plants to turn yellow. Models are used to represent an object, event, or process.
Scientific knowledge is generated by, and used for, asking questions concerning the natural world.
Quantitative methods are frequently employed. This leads to a series of investigations and research in an attempt to find the answer to the question. It is examining scientific ideas and concepts to determine their essence or meaning. Each group tries to develop a forecast based on the satellite images and their knowledge of weather patterns, the characteristics of weather systems, the motion of weather systems, and so on. Designing experiments involves planning a series of data-gathering operations which will provide a basis for testing a hypothesis or answering a question.