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Author Question: About 20 out of the thousands of known mineral species make up the bulk of the Earth's crust. ... (Read 50 times)

ghost!

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on: Jul 15, 2018
About 20 out of the thousands of known mineral species make up the bulk of the Earth's crust. Indicate whether the statement is true or false.

Question 2

Oxygen and silicon alone comprise 75 of crustal rocks by weight. Indicate whether the statement is true or false.


zacnyjessica

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Reply #1 on: Jul 15, 2018
Answer to Question 1

T

Answer to Question 2

T


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