Which state is known as "The Treasure State"?

Which state is known as "The Beaver State"? Which state is known as "The Beehive State"? Which state is known as "The Silver State"? Which state is known as "The Centennial State"? Which state is known as "The Gem State"? Which state is known as "The Equality State"? Which state is known as "The Cornhusker State"? Which state is known as "The Hawkeye State"?