What is the hardest substance of all?
Diamond
The molten rock in the mantle?
Magma
Pencils contain what substance?
Graphite
People that study the earth’s structure are called?
Geologists
_______is often used to make chalkboards
Slate
Rare, beautiful minerals that are very hard but have not yet been polished are called _______.
Gemstones
All minerals form a special kind of solid called ___
crystals
A ________is a rocklike object that looks like a mud ball on the outside but is filled with crystals on the inside
Geode
What is the most useful metal?
Iron
The rarest gemstone (our birthstone)
Rubies
_________is an example of a very durable artificial rock
Concrete
The only metal that is liquid at room temperature
Mercury
A rock that smells like mud
Shale
Decaying plant and animal matter is called
Hummus
_____is the best conductor of electricity
silver
_________ is a lightweight, nonmagnetic rust proof metal
Aluminum
Two types of weathering?
Chemical and Physical
Oil in it’s natural state is called
Petroleum or crude oil
_____are fossils that form when mud buries plant or animal and then quickly hardens around it
Mold
An underground spring is called a _____
Geyser
A person who explores caves
Spelunker
Fossils were most likely formed by
The great Flood
Plant and animal remains that have turned to stone are called
Petrified
Radioactive metal
Uranium
