Types of Rocks
This type of rock forms from cooled lava or magma.
What is igneous rock?
This scale is used to measure how hard a mineral is.
What is the Mohs hardness scale?
This process breaks down rocks into smaller pieces.
What is weathering?
The hardest mineral on Earth.
What is diamond?
This is how a mineral reflects light (it could be shiny or dull).
What is luster?
This rock type forms when layers of sediments are pressed together over time.
What is sedimentary rock?
This yellow mineral smells like rotten eggs when scratched.
What is sulfur?
Sediment becomes sedimentary rock through this two-part process.
What are compaction and cementation?
The only rock humans can eat.
What is salt (halite)?
This is the color of the powdered form of a mineral, tested by rubbing it on a tile.
What is streak?
This rock type changes form due to heat and pressure.
What is metamorphic rock?
A mineral must be this to be considered a true mineral. (Not manmade.)
What is naturally occurring?
Magma becomes igneous rock through this process.
What is cooling and solidification?
The rock is actually made from tiny pieces of once-living organisms.
What is limestone?
This word describes how a mineral breaks along flat surfaces.
What is cleavage?
Basalt and granite are examples of this rock type.
What is igneous rock?
This shiny mineral is also called "fool's gold."
What is pyrite?
Rocks melting into magma happens under this condition.
What is extreme heat (and sometimes pressure)?
The softest mineral on the Mohs scale.
What is talc?
This word describes how easily a mineral can be scratched.
What is hardness?
Limestone turning into marble is an example of this rock transformation.
What is metamorphism?
This mineral can be scratched by a fingernail and is often used in baby powder.
What is talc?
This rock cycle process turns any rock into sediment.
What is erosion?
This shiny black volcanic glass was used by ancient people to make tools.
What is obsidian?
This is the word for a mineral breaking with uneven or jagged edges.
What is fracture?