front
The boundary between two air masses with different temperatures and densities. See cold front, warm front.
Subject:
Chapter 6 - Biogeography: Climate, Biomes, and Terrestrial Biodiversity
forest
Biome with enough average annual precipitation (at least 76 centimeters, or 30 inches) to support growth of various tree species and smaller forms of vegetation. Compare desert, grassland.
Subject:
evergreen plants
Plants that keep some of their leaves or needles throughout the year. Examples are ferns and cone-bearing trees (conifers) such as firs, spruces, pines, redwoods, and sequoias. Compare deciduous plants, succulent plants.
Subject:
ecotone
Transitional zone in which one type of ecosystem tends to merge with another ecosystem. See edge effect.
Subject:
desert
Biome in which evaporation exceeds precipitation and the average amount of precipitation is less than 25 centimeters (10 inches) a year. Such areas have little vegetation or have widely spaced, mostly low vegetation. Compare forest, grassland.
Subject:
deciduous plants
Trees, such as oaks and maples, and other plants that survive during dry seasons or cold seasons by shedding their leaves. Compare coniferous trees, succulent plants.
Subject:
coniferous trees
Cone-bearing trees, mostly evergreens, that have needle-shaped or scale like leaves. They produce wood known commercially as softwood. Compare deciduous plants.
Subject:
coniferous evergreen plants
Cone-bearing plants (such as spruces, pines, and firs) that keep some of their narrow, pointed leaves (needles) all year. Compare broadleaf deciduous plants, broadleaf evergreen plants.
Subject:
cold front
Leading edge of an advancing mass of cold air. Compare warm front.
Subject:
climate
Physical properties of the troposphere of an area based on analysis of its weather records over a long period (at least 30 years). The two main factors determining an area's climate are temperature, with its seasonal variations, and the amount and distribution of precipitation. Compare weather.
Subject:
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