Chapter 2 Lesson 2-5 Flashcards
How do geologist classify igneous rock?
Origin texture and mineral composition
Igneous rock theft formed when magma hardened beneath earths surface
Intrusive rock(INtrusive-IN earth) example=granite
Igneous rock that formed when lava erupted on earths surface
Extrusive rock
Rapidly cooling lava forms….
Fine grained igneous rock with little to no crystals
Lava low in silica forms…
Lava high in silica forms….
Light colored rocks
Dark colored rocks
What rock is used for tools and building throughout history
Igneous
Small solid pieces of material
Sediments
Sequence process sedimentary rocks form from
Weathering,erosion,deposition,compaction,and cementation
Weathering- effects of freezing and thawing,plant roots,acid,and other forces on rock
Erosion-process by which running water,wind, or ice carry away bits of rock
Deposition
Process by which settlements settle
Compaction
The process that presses sediments together
When dissolved minerals crystalize and GLUE particles of sediment together
Cementation
What are the three major types of sedimentary rock?
Clastic, organic, and chemical rocks
Clastic rock
A sedimentary rock formed when fragments of rock are squeezed together
Organic rock
Formed when remains of plants and animals are deposited in layers
What kind of rock forms when minerals dissolve in a crystalize dewater solution
Chemical rock
A rock that forms another rock as a result of heat and pressure
Metamorphic
Where are metamorphic rocks found?
In mountains near masses of igneous rock
What are ways that metamorphic rocks form
- While Lava pockets rise through the crust its heat temperature can change rock to metamorphic
- pressure can form metamorphic rock, deeper the rock is the more pressure on the rock
How are metamorphic rocks classified
According to The arrangement of the grains that make up the rock
Metamorphic rock that have parallel lines or bands of grains
Foliated rocks(slate)
Non foliated rocks(marble or quartzite)
Grains in rocks are randomly arranged
What are marble and slate used for
Building and sculpting
