The weather in Crater Lake National Park, Every point around the Lake may be seen steep slopes of loose material which seems to have slid down from the Rim. These are known as talus slopes and are the result of weathering of the lavas, causing slide material to accumulate at the greatest angle of repose. The action of the rain and air on the materials composing the talus has caused their iron content to reach several stages of oxidation. In other words, the rocks have rusted and the tints of yellow, red, brown, and gray tell a story of varying oxygen content. It will be observed that the plant life along the Rim both aids and prevents erosion. Erosion is speeded up by growing plants which send their roots into the joints of the lava beds and
