What is the key concept for this section? Explain how different combinations of annual precipitation and temperatures averaged over several decades, along with global air circulation patterns and...

What is the key concept for this section? Explain how different combinations of annual precipitation and temperatures averaged over several decades, along with global air circulation patterns and ocean currents, lead to the formation of deserts, grasslands, and forests. What is a biome? Explain why there are three major types of each of the major biomes (deserts, grasslands, and forests). Explain why biomes are not uniform. Describe how climate and vegetation vary with latitude and elevation.