Earth's polar regions (above 60° latitude) are classified as deserts because __________.

• A. they are covered by dense forests
• B. they have high temperatures year-round
• C. they receive very little precipitation annually
• D. they have the highest biodiversity on Earth

Answer: (C)

Verified step by step guidance

1. Understand the definition of a desert: A desert is typically characterized by receiving very little precipitation annually, regardless of temperature or biodiversity.
2. Analyze the polar regions: Earth's polar regions, such as the Arctic and Antarctic, are cold year-round and have limited precipitation, often in the form of snow.
3. Eliminate incorrect options: Dense forests, high temperatures, and high biodiversity are not characteristics of polar regions. These features are more typical of tropical or temperate ecosystems.
4. Focus on precipitation: The defining feature of polar regions as deserts is their low annual precipitation, which aligns with the definition of a desert.
5. Conclude that the correct answer is: 'they receive very little precipitation annually,' as this is the primary reason polar regions are classified as deserts.