Vocabulary A. Define permafrost. B. To help you remember its meaning, what two words could you create from the word "permafrost"?

A. a thick subsurface layer of soil that remains frozen throughout the year, occurring chiefly in polar regions.

B. An frozen subsoil could help you remember

Explanation:

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c.to compare several aspects of the tragedy to other worldwide tragedies

the following key ideas correctly express the key sentence.

restate key idea: most people can learn to swim in ten short lessons.

restate key idea: the majority of water-accident victims require mouth-to-mouth breathing.

restate key idea: an empty, tightly closed gallon jug will support a tired swimmer.  

restate key idea: first aid is to prevent accidents as well as assist in rescue.

explanation: the key idea needs to have the same topic as the key sentence (drowning and safety).