Answer:
The overall climate in the United States of America (USA) is temperate, with notable exceptions. Alaska has an Arctic tundra climate, while Hawaii and South Florida have a tropical climate. The Great Plains are dry, flat and grassy, turning into arid desert in the far West.
It becomes a metamorphic rock, hence the name. Its "metamorphosis" is brought on by the heat and pressure.
Because it is the coldest contintent on earth :)