Final answer:
Coniferous forests primarily cover mountains and are common in cold, arid environments and high altitudes, such as the Rocky Mountains and Siberian boreal forests.
Step-by-step explanation:
Coniferous forests often cover landforms such as mountains and boreal forests.
They are the dominant form of vegetation in cold or arid environments and at high altitudes, including regions like the Rocky Mountains of North America, the European Alps, and the vast boreal forest belt of Siberia.
These forests are adapted to environments with low temperatures and are rich in soil carbon, as decomposition is inhibited by the cold, often waterlogged soils. Coniferous trees, such as spruces, firs, and pines, thrive in these ecosystems and form the primary vegetation in these areas.