________ dominate subsistence agriculture
A) Lettuces and other leafy vegetables
B) Various varieties of squash
C) Potatoes, yams, and other tubers
D) Rice and other grains
E) Pigs and chickens
Answer: D
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Which of the following is true about how a stream erodes material?
A) Abrasion is concentrated on the upstream side of obstructions. B) Turbulence of the water is less important than the temperature, which affects viscosity. C) Erosion occurs equally on two sides of a bend. D) Water cannot erode unless it is carrying sediment. E) All of these are correct.
Flow in which there is no mixing between parallel layers in the water is known as ____
A)turbulent flow B)outflow C)intermittent flow D)laminar flow E)stream flow
Atmospheric shortwaves tend to ____ when they approach a longwave trough and ____ when they approach a ridge
A) deepen; deepen B) deepen; weaken C) weaken; deepen D) weaken; weaken
Which of the following statements about water is true?
A. At temperatures above 4°C, warmer water will rise. B. At temperatures between 0°C and 4°C, warmer water will rise. C. At temperatures above 4C, warmer water will sink. D. At temperatures below 0°C, warmer water will sink.