2Environmental Factors Biotic FactorsFeatures of an environment that are alive or were once alive.
3Environmental Factors Abiotic FactorsNonliving factors in an environment.Include:air, water, soil, sunlight, temperature, and climate.Often determine which organisms can live in the environment.
4Air Atmosphere Air that surrounds the Earth Contains: 78% nitrogen21% oxygen0.94% argon0.03% carbon dioxideTraces of other gasesAir is very important as most organisms need either oxygen or carbon dioxide to live (photosynthesis and respiration).
5WaterWaterMany life processes, such as photosynthesis, respiration, and digestion require water.In fact, most organisms are 50% to 95% water.Environments that have more water usually support a greater diversity of and a larger number of organisms.
6SoilSoilMixture of minerals, rocks, living and dead organisms, water, and air.Humus - Decaying matter found in soil.Soil has an impact on the types of plants that can grow in an environment.
7Sunlight Sunlight Main energy source in an environment. Used by producers to make food (sugars).Transferred to consumers when producers are eaten.
8Temperature Temperature Depends on the amount of energy received from the sunAmount of energy received depends on the latitude and elevation of the area.Most organisms must maintain a body temperature between 0 and 50 degrees Celsius in order to survive.
9TemperatureLatitudeDetermines the amount of energy received by the sun.Sunlight strikes the Earth directly at the Equator resulting in large amounts of energy and high temperatures.Sunlight strikes the Earth at the poles at an angle resulting in smaller amounts of energy and low temperature.
10Temperature Elevation Air molecules in the atmosphere trap heat from the sun and serve as a layer of insulation for the Earth.Because more air molecules are at sea level than are at high elevations temperature decreases with increasing elevation.
11Climate Climate The average weather conditions in an area. Includes temperature, precipitation, and wind.
12ClimateWindMovement of air particles from areas of high pressure (cold) to areas of low pressure (warm)
13Climate Rain Shadow Effect When air reaches a mountain it is forced upward.As the air rises, it cools and releases any moisture it contains.By the time the air reaches the far side of the mountain it is relatively dry.