WorksheetsIgneous Rocks
Total questions: 23
Worksheet time: 12mins
Igneous rocks that form deep underground will develop textures that are
coarse-grained due to slow cooling of magma
coarse-grained due to rapid cooling of lava
fine-grained due to slow cooling of magma
fine-grained due to rapid cooling of lava
A fine grained igneous rock with a mineral composition of 35% quartz, 35% potassium feldspar, 15% plagioclase feldspar, 10% biotite, and 5% amphibole is called
Basalt
Andesite
Obsidian
Rhyolite
Obsidian's glassy texture indicates that it formed
slowly, deep below Earth's surface
slowly, on Earth's surface
quickly, deep below Earth's surface
quickly, on Earth's surface
Igneous rock that forms from lava on Earth's surface
Extrusive Rock
Intrusive Rock
Where is magma found?
inside Earth
on the surface of the Earth
Where is lava found?
inside Earth
on the surface of the Earth
Rhyolite is a fine-grained, extrusive, igneous rock. How did it form?
rapidly cooling lava
slowly cooling magma
Pegmatite is a coarse-grained, intrusive, igneous rock. How did it form?
rapidly cooling lava
slowly cooling magma
The size of crystals in Igneous Rocks depends upon
pressure
the presence of air
the presence of water
cooling rate
The color of an Igneous rock tells about the rock's
location
texture
cooling rate
composition
Mafic rocks are
light in color due to high silica content
coarse-grained
dark in color due to their high iron and magnesium content
fine grained
How are igneous rocks classified?
origin, texture and mineral composition
origin, color and texture
texture, color, and mineral composition
by their grains
Which processes are involved in the formation of Igneous rocks?
melting and solidification
heat and pressure
deposition, burial, compaction and cementation
What is the environment of formation for Intrusive igneous rocks?
Volcanic
Plutonic
What is the environment of formation for Extrusive igneous rocks?
Volcanic
Plutonic
What is the texture and grain size of Intrusive igneous rocks?
fine and less than 1mm
fine and greater than 1mm
coarse and less than 1 mm
coarse and greater than 1mm
In Igneous rock, an increase in the cooling time of magma will lead to ________ crystal size.
larger
smaller
What is the texture and grain size of Extrusive igneous rocks?
fine and less than 1mm
fine and greater than 1mm
coarse and less than 1mm
coarse and greater than 1mm
Compared to mafic rocks, the color and density of felsic igneous rocks are generally
lighter color and lower density
lighter color and higher density
darker color and lower density
darker color and higher density
