Chapter 2

Geography
orbit
The path one body makes as it circles around another body
revolution
A circular journey: 365 1/4 days
axis
An imaginary line around which a planet spins. Earth’s axis runs through its center from the north pole to the south pole
rotation
A complete turn in 24 hours
vegetation
Plants that grow in a region
tundra
An area of cold climate and low-lying vegetation. 2 types of it Alpine and Arctic
canopy
the dense mass of leaves and branches forming the top layer of a forest
savanna
A flat grassy region, or open plain with scattered tree and thorny bushes tropical grasslands
desert scrub
Deserrt vegetation that needs little water
desiduious trees
A tree that loses its leaves in the fall
coniferous
A tree that produces cones that carry seeds

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