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julia-pushkina [17]
3 years ago
9

What is silicon, oxgyen, aluminum chemical composition. A. crust B. mantle C. cores​

Biology
1 answer:
PolarNik [594]3 years ago
5 0

Answer:

A. Crust

Explanation:

The most common chemical elements in the crust are oxygen (46.6%), silicon (27.7), aluminum (8.1), iron (5.0), calcium (3.6), potassium (2.8), sodium (2.6), and magnesium (2.1). These figures vary among different studies because we really have no way to know for sure.

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When the pure food and drugs act was first passed, drugs were legally required to be:?
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Pure and accurately labeled. 

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3 years ago
Advantages of written communication​
Pachacha [2.7K]

Answer:

Advantages of written communication: Easy to preserve: The documents of written communication are easy to preserve. Oral and non-verbal communication cannot be preserved. If it is needed, important information can be collected from the preserved documents.

6 0
2 years ago
Which of the following is not one of the advantages that a closed circulatory system has over an open circulatory system? A. The
Digiron [165]

Answer:

The correct answer is option A. "The contents of blood come into closer contact with tissues in a closed system than an open system".

Explanation:

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3 years ago
Why are drift nets a problem?
devlian [24]
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5 0
3 years ago
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Flowers are a collection of _____ tissue produced by some plants.
Lostsunrise [7]
There are choices for this question namely:

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3 years ago
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