ENV GEOSCIENCE (mod 1)

primary rocks are ___

• clastic

• sedimentary

• igneous

• metamorphic

most abundant metal in earth crust

• Si

• Al

• Mg

• Fe

molten rock is called

• sill

• tuff

• lava

• magma

plutonic rocks are ___ rocks

• intrusive igneous

• extrusive igneous

• quiet igneous

• none of these

magma solidifying at intermediate depths forms ___ rocks

• explosive igneous

• metamorphic

• hypabyssal

• quiet igneous

magma solidifying at great depths forms ___ rocks

• plutonic

• hypabyssal

• granitoid

• clastic

cooling and solidifying of volcanic eruptions result in the formation of ___ igneous rocks

• plutonic

• hypabyssal

• quite

• explosive

intrusive igneous rocks with both roof and floor convex upwards is called ____

• laccolith

• phacolith

• batholith

• lopolith

an example of basic igneous rock is ___

• peridotite

• granite

• basalt

• obsidian

ultrabasic igneous rocks have silica percentage ____

• >65

• 55-65

• 45-55

• <45