Weather forecasts influence decisions concerning human activity. Use a variety of simple instruments such as a thermometer, barometer, wind vane, and rain gauge to measure changes in the weather. Construct charts and graphs which track weather changes on a daily basis. Relate how changes in the weather influence daily activities. Grades 4-5 Components of Earth 1.
Rocks are natural combinations of one or more minerals and are formed under a variety of conditions.
Rocks, minerals, and soils are classified according to their physical properties. Sort and classify samples of Earth materials according to physical properties such as color, luster, density, particle size, and shape. Soil is composed of rock material broken down by weathering and erosion and organic material that is decomposed. A soil's composition varies from place to place and helps determine which plants grow in a particular area. Use the results of this investigation to defend the reasons a farmer might fertilize or irrigate crop land.