2. Rocks, Minerals and the Rock Cycle Flashcards
Outline the five states of the rock cycle.
- Magma
- Igneous rock
- Sediment
- Sedimentary rock
- Metamorphic rock
What are rocks?
The aggregate of minerals
What are minerals?
Naturally-occurring pure substances of a specific chemical composition.
What are crystals?
An inorganic solid composed from a repeated molecular structure.
What are the three main rocks?
- Igneous
- Sedimentary
- Metamorphic
What are igneous rocks?
Rocks formed from the cooling of magma.
What are the three ways igneous ores can form?
- Solidification.
- Cooling.
- Volcanic emissions.
What are sedimentary rocks?
Rocks which have been formed from the compaction of sediment. Sedimentary rocks cannot be dated as they are formed from multiple different rocks.
Can sedimentary rocks be dated?
Yes, but the results are not trustworthy.
What are the three types of sedimentary rock?
- Clastic - Made from rock fragments.
- Chemical - Formed from precipitation of solutions.
- Organic - Deposited by living organisms.
What are metamorphic rocks?
The bridging gap between solid and liquid state
What is Mafic lava?
Thin layers of lightly-coloured lava commonly found in mid-ocean ranges. Because Mafic rocks are lighter in texture, they result in weaker eruptions which is most commonly traced to their lacking silica content. Mafic lava creates basalt.
What is Felsic lava?
Thick, darkly-coloured lava commonly recovered in convergent zones. Mafic lava eruptions are chaotic, as their high silica content results in great explosions. Felsic eruptions are dark in colour and create rholite.
What are the silicates?
A compound of silicon and oxygen found in many igneous rocks. Silicates are the most common minerals on the earth.
What is the principle for crystal formation?
The faster a crystal forms, the smaller the crystals formation size is.