Cold air is dense and warmer air is less dense and so as the cool dense air sinks the warm air rises and takes its place causing a convection current. This is the same with water and other gaseous and liquid substances.
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Explanation:
Americans are more racially and ethnically diverse than in the past, and the U.S. is projected to be even more diverse in the coming decades.
Women’s role in the labor force and leadership positions has grown dramatically.
The world is aging. The demographic future for the U.S. and the world looks very different than the recent past. Growth from 1950 to 2010 was rapid — the global population nearly tripled, and the U.S. population doubled.
Christians are declining as a share of the U.S. population, and the number of U.S. adults who do not identify with any organized religion has grown.
The share of Americans who live in middle class households is shrinking
The American family is changing. After decades of declining marriage rates, the share of American adults who have never been married is at an historic high.
Answer:
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Explanation:
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Answer:
what looks like you copy pasted a homework thing
