If used, those materials can be extended through recycling and decreased use. Environments include the space, conditions, and factors that affect individual's and population's ability to survive and quality of life. Changes in environments can be natural or influenced by humans. Some changes are good, some neither good nor bad, and some are bad. Pollution is a change in the environment that can influence the health, survival, or activities of organisms, including humans.
Some environmental changes occur slowly, and others occur rapidly.
The sun, moon, stars, clouds, birds, and airplanes all have properties, locations, and movements that can be described and that may change. Objects in the sky have patters of movement. The Sun, for example, appears to move across the sky in the same way every day, but its path changes slowly over the seasons. The moon moves across the sky on a daily basis much like the sun. The shape of the moon seems to change from day to day in a cycle that lasts about a month.