Which of these geographic features most directly influences the climate of Nevada by limiting the amount of water vapor that can reach the state and fall as rain? OPTIONS:
- Pacific Ocean
- Colorado River
- Sierra Nevada Mountains
- Columbia River Basin
A: Sierra Nevada Mountains

How is the structure of an atom best described? OPTIONS:
- a negative core surrounded by densely packed matter
- a neutral core surrounded by mostly empty space
- a positive core surrounded by mostly empty space
- a positive core surrounded by densely packed matter
A: a positive core surrounded by mostly empty space

What is the composition of the nucleus of an atom? OPTIONS:
- ions and electrons
- electrons and protons
- protons and neutrons
- neutrons and electrons
A: protons and neutrons

Since 1961, Nevada has led the United States in production of which resource? OPTIONS:
- gold
- uranium
- lumber
- iron
A:
gold