Transcript ROCK FORMATION - OpenStudy.com

44. Use the information about igneous rocks a-d
to classify each one as intrusive or extrusive and
basaltic or granitic. Fill in the chart with a,b,c,d
Rock a- dark colored large grains
Rock b- large crystals, high percentage of silica
Rock c- fine grained texture, light colored
Rock d- from Hawaiian volcano area no visible
crystals
extrusive
intrusive
basaltic
1
2
granitic
3
4
• Basaltic (buh SAWL tihk) igneous rocks
are dense, dark-colored rocks.
• Basaltic lava is fluid and flows freely from
volcanoes in Hawaii, such as Kilauea.
• Granitic igneous rocks are light-colored
rocks of lower density than basaltic rocks.
• Granitic magma is thick and stiff and
contains lots of silica but lesser amounts
of iron and magnesium.
extrusive
intrusive
basaltic
1D
2A
granitic
3C
4B