The term 'Frozen Expanse' refers to two distinct geographical features: a TUNDRA and an icesheet. A TUNDRA is a vast, treeless plain found in the Arctic regions of Europe, Asia, and North America. It is characterized by permanently frozen subsoil, low temperatures, and short growing seasons. An icesheet is a large mass of glacial ice that covers a large area of land. It is usually found in polar regions and is composed of snow and ice that has accumulated over thousands of years. Both the TUNDRA and icesheet are important components of the Earth's climate system, and together they form a frozen expanse.