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Recall the pronoun chart:
Yo || Nosotros
Tu || (vosotros)
Usted/el/ella || Ustedes/ellos/ellas
We can immediately eliminate B and C, because ellos is "them" not "you all" and usted is the singular "you".
This is a tricky question because in Spain, remember that they use vosotros, unlike in Latin America. But if you look at the chart, remember that tu is an informal pronoun; if its plural counterpart is vosotros, then vosotros must also be informal. Ustedes, on the other hand, is the formal version of "you all". It is used as the informal AND formal "you all" in Latin America, but in Spain it acts only as the formal pronoun.
So if you are talking to two or more people in Spain, you'll want to use option D, ustedes.
Answer:
lithosphere is the rigid outer part of the earth, consisting of the crust and upper mantle.The lithosphere extends from the surface of Earth to a depth of about 44-62 mi (70-100 km).
Number 9 is asking what do you work on.Number 10 is asking what is the purpose of the trip
