Heavy moss hangs from four old-growth sitka spruce (Picea sitchensis) trees in the Hoh Rain Forest in Olympic National Park, Washington. The Hoh Rain Forest is one of the largest temperate rain forests in the United States. The sitka spruce trees can grow to be 300 feet (100 meters) tall, with a diameter of 16 feet (5 meters). Trees in the Hoh Rain Forest can grow to tremendous size as the area receives an average of 150 inches (4 meters) of rain annually.
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