Science - Chapter 10 Rocks
Sedimentary rock formed from rock fragments is called
clastic
One example of a chemical sedimentary rock is
evaporites
Light-colored igneous rocks are part of the
felsic family
The splitting of slate into flat layers illustrates its
foliation
Contact metamorphism is a result of
hot magma
The process in which rock changes from one type to another and back again is called
the rock cycle
Rock that forms from magma is called
Igneous
Suppose you found an igneous rock with a coarse texture. Would the magma that formed the rock have colled slowly or quickly?
It would have cooled slowly because it would have been in intrusive rock, and you get a course structure from rough crystals
What type of rock will be formed from a sedimentary rock that comes under extreme pressure and heat but does not melt?
Metamorphic (formed by heat and pressure)
Explain how metamorphic rock can change into either of the other two types of rock through the rock cycle.
Metamorphic to Igneous = melt, cool., and harden, Metamorphic to Sedimentary = weather and lithification
Which would be easier to break, the foliated rock slate or the nonfoliated rock quartzite?
The foliated slate is easier to break becaue foliated rocks break in flat thin sheets (mineral bands)
The Himalayan mountains are located on a boundary between two colliding tectonic plates. Would most of the metamorphic rock in that area occur in small patches or wide regions?
Wide regions because of regional metamorphism
Some of the powdery rock found on the moon serves as the cementing agent for sedimentary moon rocks. What type of sedimentary rocks are these?
Clastic because they are made of pieces of rock. Formed by compaction that holds rocks together
A certain rock is made up mostly of plagioclase feldspar and pyroxene minerals. It also includes olivine and hornblende. Will the rock have a light or dark coloring?
Dark coloring because it has less silica
If you know that a certain area in South Dakota has a number of laccoliths, what might you expect the landscape to look like?
Dome mountains because they don't break the surface
There is a huge batholith in the northwestern part of Idaho. What can you say about that landscape in that area?
Mountainous - form the core of mountains
Imagine that you have found a piece of limestone, a sedimentary rock, with strange-shaped lumps on it. Will the lumps have the same composition as the limestone?
No because the lumps are pieces of some other things (rocks, shells, etc)
Magma that solidifies underground forms rock masses that are known as
intrusions
Intrusive igneous rocks are characterized by a course-grained texture because they contain
large crystals
One example of an extrusion is a
lava plateau
Regional metamorphism is a result of
plate movement