C. cooling of molten lava or magma
Igneous rocks form from the cooling and solidification of molten rock material, either magma beneath the Earth's surface or lava that erupts and solidifies at the surface.
How do igneous rocks form?
A. heating and added pressure to existing rock
B. evaporation of seawater
C. cooling of molten lava or magma
D. compaction and cementation of sediment
11 answers
Which type of sedimentary rock is formed from fragments of minerals or rocks?
A. organic
B. caustic
C. clastic
D. intrusive
A. organic
B. caustic
C. clastic
D. intrusive
C. clastic
Clastic sedimentary rocks are formed from fragments (clasts) of pre-existing minerals and rocks that are cemented together.
How are igneous rocks classified?
A. by texture and composition
B. by cooling rate
C. by the degree of foliation
D. by color
A. by texture and composition
B. by cooling rate
C. by the degree of foliation
D. by color
A. by texture and composition
Igneous rocks are classified based on their texture (which relates to the size and arrangement of their mineral grains) and composition (which refers to the minerals present in the rock).
The metamorphic rock marble will dissolve in the presence of a weak acid.
Which rock probably was changed into marble by the addition of heat and pressure?
A. limestone
B. shale
C. granite
D. sandstone
Which rock probably was changed into marble by the addition of heat and pressure?
A. limestone
B. shale
C. granite
D. sandstone
A. limestone
Marble is a metamorphic rock that forms from the alteration of limestone under heat and pressure.
A metamorphic rock has grains arranged in parallel layers or bands.
What property is this rock displaying?
A. nonfoliated
B. stratification
C. layering
D. foliation
What property is this rock displaying?
A. nonfoliated
B. stratification
C. layering
D. foliation
D. foliation
Foliation is the property of a metamorphic rock where the mineral grains are arranged in parallel layers or bands.
An igneous rock is composed primarily of quartz and feldspar.
What type of magma most likely formed this rock?
A. plutonic
B. volcanic
C. mafic
D. felsic
What type of magma most likely formed this rock?
A. plutonic
B. volcanic
C. mafic
D. felsic
D. felsic
An igneous rock composed primarily of quartz and feldspar is typically formed from felsic magma, which is rich in silica and contains lighter-colored minerals.