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zloy xaker [14]
3 years ago
12

(PLEASE HELP) Which of the following groups of people sent the most immigrants to Mexico in the 19th and 20th centuries?

Geography
2 answers:
dybincka [34]3 years ago
8 0

Spanish is the correct answer

ozzi3 years ago
3 0

Answer: Spanish

Explanation:

After Mexico achieved independence from Spain (officially in 1821), immigration to Mexico came essentially from Europe, especially from Spain, but also from France, Italy, Ireland, England and Germany.

It should be noted that between the 19th and 20th centuries, many of the immigrants in Mexico were Spanish, despite the resentment and suspicion towards them as a result of three long centuries of conquest. <u>This is because the Mexican governments of the newly established Republic wanted to attract a large foreign immigration to promote and consolidate the development  of the nation. </u>In addition, they wanted to populate the vast territory of the north of the country and develop agriculture, for which they enacted laws and decrees that sought to encourage European immigration.

However, not all immigrants were Spanish; Americans, French, Germans, English, Italians and Russians arrived, among the most favored, as well as Japanese, Chinese and Korean. Also Lebanese and Jews, who along with the Chinese appeared in the markets much more modestly than the Europeans.

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Analysis of a rock sample that it contains 6.25% of its original uranium-235. How old is the rock? How do you know?
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Answer:

The age of the rock = 2800.6 million years = 2.8 billion years.

A simple method of analysis similar to Carbon dating is used to obtain the required age of the rock. Radioactive substances decay according to first order reaction kinetics. So, plugging all the required parameters into the general equation for amount of substance left in a first order decay gives us the age of the rock.

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The decay of radioactive substances follow first order reaction kinetics.

The general equation is given as

A(t) = A₀ e⁻ᵏᵗ

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k = decay constant

The decay constant is related to the half life (T) through the relation,

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Hope this Helps!!!

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