200
The country's ____ oil fields are their best resource.
 
The mountain was ________.
 
A _______ was an early animal rather like a furry elephant.
 
_________ circuit breaker.
 
The boy felt _____________ among the crowds of people.
 
A crystalline solid is a solid material whose constituents (such as atoms, molecules, or ions) are arranged in a highly ordered ___________ structure, forming a crystal lattice.