Asking questions and querying others' explanations is part of scientific inquiry. Scientific investigations sometimes result in new ideas for study or generate new methods for investigation. Motions and forces The motion of an object can be described by its position, direction of motion, and speed over time. All organisms must be able to obtain and use resources and grow. Land forms are the result of a combination of constructive and destructive forces, including deposition of sediment, weathering, and erosion.
Soil consists of weathered rocks and decomposed organic material.
Soils are often found in layers, each having a different composition and texture. Water evaporates, rises and cools, condenses, and falls to the earth where it collects in lakes, oceans, soil, and in rocks underground. Clouds form by the condensation of water vapor. Living organisms have played many roles in the earth's system, including contributing to the weathering of rock. Earth's history The earth processes we see today, including erosion, are similar to those that occurred in the past.