Igneous Rocks
What type of rock forms when magma or lava cools and solidifies?
Igneous
What is 1 key characteristic of sedimentary rocks?
Porous, less durable, layers, sediment
What rock would be stronger to use in construction
Igneous
What is the rock cycle?
The process that changes rocks from one type to another
Where is Lava found
Intrusive igneous rocks form:
What is the first step of forming a sedimentary rock?
Weathering
Why is sedimentary rock not often used in construction
Easily weathered
Porous
What is sediment?
Small pieces of rock, sand, or minerals
Where is magma found
Underground
Extrusive igneous rocks form when:
Lava cools on the earth surface
Which type of rock may contain fossils?
Sedimentary
Why are igneous rocks used more in construction
more durable
weather resistant
interlocking crystals
What is cementation?
The minerals in the rocks causing them to stick together like cement
Which factor most affects crystal size in igneous rocks?
Cooling rate
Why do intrusive igneous rocks usually have large crystals?
They cool slowly
What process breaks rocks into smaller pieces?
Erosion
What is the name of the disease caused by cutting of engineered stone?
silicosis
What is compaction in sedimentary rock formation?
Sediments are compacted together with pressure
What must happen to sedimentary rocks before they can become igneous rocks?
They must melt into magma
What is the term for the crystals in igneous rocks?
Interlocking crystals
What process occurs when sediments settle in a new location?
Deposition
Why is engineered stone banned in Australia?
Causes fatal lung disease
What is meant by the term deposition?
When sediment from old rocks settle at the bottom of the ocean
Explain how Igneous rocks can turn into Sedimentary and Metamorphic rocks