Innovations in agriculture have increased food supply. This has allowed human populations to grow to approximately ________ by the end of the agriculture period

A) 1.5 billion B) 500 million C) 100 million D) 1 million E) 1 billion


Answer: B

Environmental & Atmospheric Sciences

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A) poverty. B) famine. C) the green revolution. D) food security. E) GMOs.

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The first minerals to be mined were ________ and ________

A) gold, silver B) flint, chert C) copper, bronze D) lead, quartz

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Source regions for wintertime cP air masses receive little solar radiation at the surface due to

A) low sun angles. B) high albedo. C) low sun angle and high albedo. D) low albedo.

Environmental & Atmospheric Sciences

The recurrence interval of an event, also known as its ________, is typically inversely related to the event's magnitude

Fill in the blank(s) with correct word

Environmental & Atmospheric Sciences