Wild Card
What is the hardest natural mineral on Earth?
What is a diamond?
This is melted rock that is still inside the earth.
What is magma?
You will find these ancient animal bones and imprints hidden inside sedimentary rocks.
What are fossils?
These are the two intense ingredients needed deep underground to change a rock into a metamorphic rock.
What are heat and pressure?
This is the continuous, never-ending process where rocks change from one type into another over millions of years.
What is the rock cycle?
This soft mineral is found inside your school pencils and is used to write on paper.
What is graphite?
This is melted rock that has burst outside onto Earth's surface.
What is Lava?
This common sedimentary rock is made entirely of compressed grains of sand.
What is sandstone?
When boring old limestone gets cooked and squeezed, it turns into this fancy, smooth rock used for statues.
What is marble?
This process happens when wind, rain, and ice break big rocks down into tiny pieces.
What is weathering?
This is the official 1-to-10 scale used by scientists to test how easily a mineral can be scratched.
What is the Mohs hardness scale?
This black, shiny volcanic rock looks exactly like dark glass.
What is obsidian?
This is the loose, powdery material created when rocks are broken down by wind and rain.
What is sediment?
This flat, gray rock was once shale, but now it is used to make school chalkboards and roof shingles.
What is slate?
This process happens when water or wind physically washes and carries away loose dirt and rock pieces.
What is erosion?
This is a hollow, round rock that looks plain on the outside but is filled with beautiful crystals on the inside.
What is a geode?
This light, holy volcanic rock is famous because it can actually float on water.
What is pumice?
This ocean-made rock is formed from the crushed shells and skeletons of old sea creatures.
What is limestone?
This is the term for the striped or banded look a rock gets when its minerals are squeezed into straight lines.
What is foliation?
To turn any rock into an igneous rock, the rock must first undergo this extreme heat process.
What is melting?
This soft, powdery mineral sits at a #1 on the hardness scale and is used to keep baby skin dry.
What is talc?
This coarse, speckled rock is commonly used to make strong kitchen countertops.
What is granite?
This process happens when natural minerals act like glue to stick loose sediments together into solid rock.
What is cementation?
This incredibly hard rock is born when pure sandstone gets baked under extreme pressure.
What is quartzite?
This is where sediments are finally dropped off and pile up, like at the bottom of a river or ocean.
What is deposition?