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abyssal plains
large flat areas
hydrothermal vents
gush hot, mineral rich waters
mid-ocean ridges
mountain range on ocean floor
trenches
deepest parts of ocean
density
mass divided by volume
hydrometer
measures density
air masses
bodies of air
cold front
leading edge of cold air mass
warm front
leading edge of warm air mass
trade winds
blow toward the equator
Jeanette Hubbard
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