What are the Dfa and the Dfb climates? Compare the Dfa climate of Des Moines, Iowa, with the Dfb climate of Winnipeg, Canada
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ANSWER: Dfa climates are humid continental with hot summers, while Dfb climates are humid continental with long cool summers. Both Des Moines, Iowa, and Winnipeg, Canada, experience a large annual temperature range. This is characteristic of climates located in the northern interior of continents. In fact, as we move poleward, the annual temperature range increases. In Des Moines, the annual temperature is 31°C (56°F), while 950 km (590 mi) to the north in Winnipeg, annual temperature is 38°C (68°F). Most of the summer rain is in the form of convective showers, although an occasional weak frontal system can produce more widespread precipitation, as can a cluster of thunderstorms—the mesoscale convective complex. The weather in both climatic types can be quite changeable, especially in winter, when a brief warm spell is replaced by blustery winds and temperatures plummeting well below -30°C (-22°F).
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Consider the accompanying figure and then explain how the movement of the continents can help explain why some species have the geographic distribution that is observed today.
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________ ________ happens when a firm takes over operations previously the responsibility of its suppliers
Fill in the blank(s) with correct word
The commonest form of the Carbon atom that exists is at times referred to as C12 . An isotope of this atom is called C14 . C14 must have a different number of___________than C12
a. Ions b. Protons c. Atoms d. Neutrons e. Electrons
According to the following reaction, which molecule is acting as a base? H2O + NH3 ? OH- + NH4+
A) H2O B) NH3 C) OH- D) NH4+ E) none of the above