冰岛苔藓，火山岩上的绿色地毯
In Iceland, there is a special plant called moss. It grows on old volcanic rock. This moss is very slow. It grows only about one centimeter each year.
Icelandic moss is not really a moss. It is a kind of lichen. Lichen is a mix of fungus and algae. Together they can live in hard places like cold rocks.
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