Author Question: What are the three major classifications of magma? How are they defined? What elements increase or ... (Read 50 times)

Alygatorr01285 · **on:** Jul 15, 2018

What are the three major classifications of magma? How are they defined? What elements increase or
decrease in the composition of the three types? What will be an ideal response?

Question 2

Banded iron formations consist of alternating thin layers of chert and iron minerals. Indicate whether the statement is true or false.

Pswine · **Reply #1 on:** Jul 15, 2018

Answer to Question 1

Felsic magma has more than 65 silica, mafic magma is less than 52 silica, and intermediate
magma falls in between. Sodium, potassium, and aluminum are higher in the more silica-rich magmas.
Calcium, iron, and magnesium are lower in the more silica-rich magmas.

Answer to Question 2

T