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Chapter 20, Lesson 1&2
Vocabulary Words
All the living and non-living
things in an area
ecosystem
The living things in an ecosystem
Biotic factors
All the non-living things in an
ecosystem
Abiotic factors
The average weather conditions
in an area over time
climate
The layer of gases that surrounds
the Earth
atmosphere
The continuous movement of
water from Earth to its
atmosphere and back again
Water cycle
The release of water vapor from
the leaves and stems of plants
transpiration
Water that falls from clouds to
Earth’s surface
precipitation
The process during which liquid
water changes into a gas
evaporation
The process during which water
vapor changes into liquid water
condensation