Page 50 - 雕鐫海之角

地表的岩石暴露在空氣中，慢慢的開始變
色，質地由硬變軟且破碎，最後變成土壤的過
程，稱為風化作用。東北角地區地處副熱帶，氣
侵蝕作用 差異侵蝕 候溫和且潮濕，一年中約有半年承受強烈的東北
與

Erosion processes and 季風吹拂，加以海浪侵蝕作用，風化作用進行得 風化作用
較快速，讓岩石色彩變化更加豐富，因而生成各
Differential Erosion Processes 色各樣的奇岩怪石。 Weathering Processes

雨水、河水、地下水、波浪、冰河、風、生 There are many strange rocks in the northeast Weathering is a process by which rock eventually
coast and the shapes of these rocks tell us that each the strange shape, the rock is colorful. The color is
物等對地表的破壞作用，稱為侵蝕作用。廣義的 becomes soil. There are many factors that can enhance partly due to its mineral composition and partly due to
has a different hardness. In fact, the hardness is
侵蝕作用包括搬運作用和堆積作用。在砂岩與頁 weathering processes such as salt weathering which the weathering that changes the color, especially the
related to the type of sediment and its bonding, the
岩互層的岩層裡，由於砂岩較頁岩來得堅硬，經 degree of weathering, and the degree of jointing. The can cause chemical alteration to the rock structures surface color. When the rocks are wetted by the waves
and cement. Weathering processes can increase the they sparkle and shine in the sun light.
過一段時間的風化作用或流水侵蝕之後，砂岩的 joints are formed when the crust is deformed and if rate of erosion of rock by increasing the susceptibility
there are many joints the rock is easily eroded. This
岩層較為凸出，而頁岩的岩層則凹陷進去，明顯 to wave attack. Because of the hot and humid climate,
difference in rock hardness is the main reason for the
的凹凸情形，此稱為差異侵蝕。 weathering rates are very high in Taiwan. Apart from
variety of rock forms which makes the landscape so
beautifu.

地質圖書 Geopark at Northeast and Yilan Coast National Scenic Area
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