You are reading extracts from a climate investigation file. Choose the verb form that best completes each sentence.
1. In tropical rainforests, thick vegetation moisture and helps create a warm, humid climate.
2. Satellite images show that the glacier several metres since the beginning of the decade.
3. Since the volcanic eruption began, the weather aircraft around the ash cloud without stopping for more than six hours, and its fuel level is now critically low.
4. How much sea ice in the Arctic since the first satellite measurements?
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