Metamorphic Rocks Flashcards
These rocks start off as igneous, sedimentary, or other metamorphic rocks.
Metamorphic Rocks
These rocks are changed when heat or pressure alters the existing rock’s physical or chemical make up.
Metamorphic Rocks
Property of some metamorphic rocks in which flat layers are formed; seen as evidence of squeezing by pressure.
Foliation
Steady and not likely to change significantly any more.
Stable
Does a rock still show foliation if pressure is exerted from all directions?
The rock usually does not show foliation.
Extreme pressure may also lead to the formation offoliation, or flat layers in rocks that form as the rocks are squeezed by pressure. Foliation normally forms when pressure was exerted on a rock from _____.
One Direction
The changing of rocks by heat and pressure. During this process, rocks change either physically and/or chemically.
Metamorphism
One ways rocks may change during metamorphism is by rearrangement of their mineral crystals. When heat and pressure change the environment of a rock, the crystals may respond by rearranging their structure.
True or False?
True
There are two main types of metamorphism:
Contact Metamorphism and Regional Metamorphism
Occurs when magma contacts a rock, changing it by extreme heat.
Contact Metamorphism
Occurs when great masses of rock change over a wide area due to pressure exerted on rocks at plate boundaries.
Regional Metamorphism
Hot magma within the earth contacting various rock layers is an example of?
Contact Metamorphism
