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遊黃石公園（4）

(2009-08-11 19:27:23) 下一個

黃石公園的大部分（約85%）為林木覆蓋，絕大多數樹木都是一種生命力極強的鬆樹，叫扭葉鬆，到處都是，長得也沒有出眾之處，讓你都懶得拿起相機給它們留個影。

黃石公園的水和石，那就比較奇特了。奇在一個公園裏有河，溪，湖，塘，泉，大小瀑布，特就在顏色上了，有人說那不過是一些礦物質和細菌而已，俺是一遊客，又不是科學家，管它是礦物質還是細菌，就不去深究了，看個熱鬧吧！

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圖12：梯田？

圖13：熔岩上兩枯鬆。

圖14：無意中捕捉到的光束。

West Thumb Area:

West Thumb is a caldera within a larger caldera.
Active hydrothermal features exist on the lake bottom here and elsewhere in the lake.
West Thumb Geyser basin overlooks Yellowstone Lake, the largest at high elevation in North America. You can best appreciate its vastness in winter when the frozen surface extends as a white sheet for miles. Summer is the season to appreciate the lake’s many moods. Here you can enjoy its calm, quiet mornings or witness the windwhipped whitecaps of afternoon storms. After storms, look for rainbows arching into the wilderness beyond, a land nearly as wild as when Native Americans and explorers experienced it centuries ago.
The surface of the lake hints of what exists below. Surveys of the lake bottom in the 1990s documented hot springs and hydrothermal vents just offshore in West Thumb. Look closely – you
May see their swirling patterns in the water.
As you walk among the basin’s superheated waters, you may wonder if the lake is warmer here than elsewhere. After all, the geyser basin pours an average of 3,100 gallons of hot water into the lake every day. But even here, the lake’s average summer temperature is 45F (7C).

Mammoth Hot Springs Area:

Limestone is the underlying rock here instead of rhyolite, which is dominant in the park’s other major hydrothermal areas.
This area is one of the world’s best examples of travertine-depositing hot springs.
It’s also one of the park’s most dynamic hydrothermal areas; its features constantly change.
Maximum water temperature is 165F (74C).

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