Explain the term absolute vorticity in a real-life context, such as a spinning ice skater. In your description, include the terms relative vorticity and Earth’s vorticity.?
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ANSWER: ?Answers may vary. Watching an ice skater spin counterclockwise on a frozen lake, the ice skater possesses positive relative vorticity. If you could suddenly leave Earth and watch the same spinning skater from space, you would see the ice skater spinning on a rotating platform—Earth. The combination of the skater spinning about her vertical axis (her relative vorticity) plus the small spin imparted to her from the spinning earth (Earth’s vorticity) yields the absolute vorticity of the skater.
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The amount of irrigated land used to produce food crops has increased since 1950 . It can also be said that:
a. The amount of irrigated land per person has increased since 1950 b. The amount of irrigated land per person has decreased since 1950 c. The amount of irrigated land per person has stayed the same since 1950 d. The amount of irrigated land per person for this time period is not known e. The amount of irrigated land per person has increased in some areas and decreased in others
Weeds are types of
A) pathogens that spread disease to humans or between plants. B) animals or plants that can cause disease. C) plants that can rapidly spread through lightly airborne seeds. D) pests that may threaten our health or compete with our food.
Describe the distinction between macronutrients and micronutrients. Give several examples of each, and describe their importance
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Which of the following was the cause of the debris flow in Oso, Washington, in March 2014?
A) Volcanic eruptions generated a lahar. B) A stream at the base of a slope eroded the toe of the slope away. C) Heavy rains saturated the surface materials on the slope. D) The slope was oversteepened during construction.