小同学,你知道吗,地球上的气候状况不是历来如此,当然也不会永远如此。在地球漫长的历史中,曾经出现过多次气候变冷的时期。科学家把这些时期称作冰期,把冰期与冰期之间气候比较温暖的时期称为间冰期。最早被科学家研究的是距今最近的“第四纪冰期”。他们对欧洲阿尔卑斯山上的 Little classmates, you know, the weather conditions on Earth are not always the same, and certainly not always. In the long history of the Earth, there have been times when the climate has cooled. Scientists refer to these periods as glacial periods, and the periods in which the climate between the glacial and glacial periods are relatively warm are called interglacial periods. The earliest scientists studied were the recent “Quaternary ice age.” They are on the European Alps