Does the position of the polar jet stream change during the year? If so, how and why??
What will be the ideal response?
ANSWER: On average, jet streams flow from east to west. However, their pattern is commonly a wavy west-to-east pattern. When the polar jet stream flows in broad loops that sweep north and south, it may merge with the subtropical jet. Occasionally, the polar jet splits into two jet streams. The jet stream to the north is often called the northern branch of the polar jet, whereas the one to the south is called the southern branch. Also, the north south temperature contrast along the polar front is strongest in winter and weakest in summer. This situation explains why the polar-front jet shows seasonal variations. In winter, the winds are stronger and the jet moves farther south as the leading edge of the cold air can extend into subtropical regions, as far south as Florida and Mexico. In summer, the jet is weaker and is usually found over more northerly latitudes.
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Which of the following best describes the role of biological activity influencing soil development?
A) The largest contribution organisms make to soil development is through fertilization via their waste products. B) Given the amount of time it takes soil to form, the contribution organisms make to soil development is through decomposition, alone, adding needed organic matter to soils. C) Since soil is primarily inorganic matter, the role that organisms play in soil formation and development is obvious only on the surface and top layer of soil. D) While burrowing animals churn soil, the role of other organisms in soil formation and development is mostly muted. E) All organisms living in, on, and over the soil may influence the development and characteristics of soil.
Which of the following is a common basic substance?
A. Ammonia B. Battery acid C. Black Coffee D. Orange juice
Population growth rates of various key species are important to understand, as large growth rates of any one species can easily affect the natural resources within an ecosystem. Assume that a population of 200 exotic parrots (all of the same species)
accidentally escaped from a Miami zoo during a recent hurricane. After intense efforts, 215 are recaptured one year later. Calculate the population growth rate of this parrot species, and based on this growth rate, explain how long it would have taken for this population to double in size, if they had not been recaptured. What will be an ideal response?
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