___________ rocks are the first to be formed.
None of these
___________ have higher percentages of oxides of denser elements and silica content varies between 40 to 60 percent.
Acid igneous rock
Basic igneous rock
Extrusive igneous rock
Intrusive igneous rock
Based on their origin, the igneous rocks are classified into ________ types.
____________ rocks do not contain fossils.
On the basis of chemical composition,igneous rocks are classified into _____________.
__________ are generally lack in iron and magnesium.
Extrusive igneous rocks
Intrusive igneous rocks
Basic igneous rocks
Acid igneous rocks
___________ are also called primary rocks.
__________ rocks are less affected by chemical weathering.
____________ are deep seated intrusion of igneous rocks.
_________ rocks are soft and layered.