Mafic magmas may contain up to about 75 percent SiO2 by weight. are viscous and do not flow easily. tend to inhibit passage of gas that tries to escape through it. result in less violent eruptions than felsic to intermediate magmas.

result in less violent eruptions than felsic to intermediate magmas.

Explanation:

Mafic magma results in less violent eruptions than felsic to intermediate magma.

They are predominantly made up of a high level of magnesium and iron in their composition.

b..

is the correct one

explanation:

covalent bonds form as valence electrons are shared between two atoms. lewis structures and structural formulas are common ways of showing the covalent bonding in organic molecules. formal charge describes the changes in the number of valence electrons as an atom becomes bonded into a molecule.