Rocks
Smells like mud when it is wet
What is shale?
What is graphite?
What is a geologist?
An underground spring that shoots streams of boiling water into the air from time to time
What is a geyser?
Molten rock in the mantle
What is magma?
Often used to make chalkboards
What is slate?
Hardest substance on earth
What is a diamond?
What is a mineralogist?
Oil in its natural state
What is petroleum or crude oil?
Molten rock on the earth's surface
What is lava?
What is mold fossils?
What is a ruby?
What is a paleontologist?
Two types of weathering on Earth
What is physical and chemical weathering?
Decaying plant and animal material in the soil
What is humus?
Types of fossils in which plants or animals have been turned to stone
What is petrified fossils?
Before its a polished gem it's a rare, beautiful mineral
What is a gemstone?
One who explores caves
What is a spelunker?
Lightweight, nonmagnetic, rustproof metal
What is aluminum?
A very durable artificial rock
What is concrete?
Granite, pumice, and obsidian
What are igneous rocks?
What is a crystal?
Marie Curie and her husband experimented with this radioactive metal used for nuclear power now
What is uranium?
Best conductor of electricity
What is silver?
Most useful metal
What is iron?