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unit 13

Horizontales
the structures below the surface of the ground that support a building
the study of light and of instruments using light
(especially of moving objects) to hit something violently
to make something pure or improve something, especially by removing unwanted material
the increase in something's speed, or its ability to go faster
the curved path through which objects in space move around a planet or star
an occasion when you seem to suggest something without saying it directly
arrangement involves two people or groups of people who behave in the same way or agree to help each other and give each other advantages.
completely different
the force that attracts objects towards one another, especially the force that makes things fall to the ground
the amount of matter in any solid object or in any volume of liquid or gas
Verticales
not proud or not believing that you are important
using new methods or ideas
the force that makes it difficult for one object to slide along the surface of another or to move through a liquid or gas
to (cause to) separate into parts or groups
he rise and fall of the sea that happens twice every day
something that you contribute or do to help produce or achieve something together with other people, or to help make something successful
to use something such as authority, power, influence, etc. in order to make something happen
a woman whose husband or wife has died and who has not married again
lack of activity or interest, or unwillingness to make an effort to do anything