What is true about air? O cool air rises and warm air sinks
sinking air cools and rising air warms
sinking air warms and rising air cools
O warm air rises and cool air sinks
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Which of the following statements about the migration of workers to other countries is false?

Use your vocabulary words to complete the sentences below. more of the world's population is now concentrated in heavily populated urban areas known as a this is quite a contrast from the past when or native groups were either farmers or — hunters and gatherers who moved between places in search of food. advanced technology has led to the integration of world economics and cultures, in the world's more developed countries. this integration requires , the responsible use and management of natural resources.

What is the approximate chemical composition of the solar nebula?