You are reading extracts from a climate investigation file. Choose the verb form that best completes each sentence.
1. Desert nights heat in the same way as desert days, which is why temperatures can drop sharply after sunset.
2. Satellite images show that the glacier several metres since the beginning of the decade.
3. Since the beginning of the heatwave, the desert observatory night-time temperatures every hour, and the latest readings still show almost no cooling after sunset.
4. How much sea ice in the Arctic since the first satellite measurements?
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