Larger than dust, this particulate matter from volcanoes ranges from .01 to .16 inches in diameter
It's a fracture of the Earth's rocky outer shell where sections of rock slide against each other
An analysis of seawater shows that about 78% of the total solids are this one mineral
This electrically charged layer of the atmosphere makes long-distance radio communication possible
From the Latin for "flowing together", it's where 2 or more streams flow together to form one
In a mining lode, the gangue is the junk & this is the mineral with the good stuff in it
It's not just oil -- Saudi Arabia has reserves of over 200 trillion cubic feet of this
Seismographers use the difference in speed between P waves & S waves to locate this point
(Sarah of the Clue Crew) Venice is sinking because Italy is actually part of this continent's plate & it's sliding under Europe's plate