Science "Rocks" Test Study guide Flashcards
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