Use data to construct a reasonable explanation. Physical Science Materials can exist in different states solid, liquid, and gas. The surface of the earth changes. Some changes are due to slow processes, such as erosion and weathering. Resources are things that we get from the living and nonliving environment to meet the needs and wants of a population.
Some resources are basic materials, such as air, water, and soil.
The supply of many resources is limited. If used, resources can be extended through recycling and decreased use. Changes in Environments Environments are the space, conditions, and factors that affect an individual's and a population's ability to survive and their quality of life. Changes in environments can be natural or influenced by humans. Some changes are good, some are bad, and some are neither good nor bad.