Which statement about solar wind is false?
A) Solar wind is created by fast-moving protons and electrons.
B) Solar wind is caused by heat in the Sun.
C) Solar wind includes periodic blasts of air.
D) Our Sun's solar winds are less intense now than in its early history.
Answer: C
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Chinese interregional migration in recent years has primarily been from
A) mountain regions to coastal regions. B) big cities to medium size cities. C) rural to urban areas. D) urban to rural areas. E) factory jobs to farming jobs.
Research by social scientists suggests that it takes ____ percent of the population of a community, country, or the world to bring about major social change.
A. 1?2 B. 5?10 C. 20?30 D. 40?50 E. 70?75
Which factor does NOT contribute to the intensity of a wildfire?
a. local temperature b. type of vegetation c. wind speed d. the initial cause of the fire e. moisture content of the fuel
Imagine a large state park near your home. Which of the following are probably the most crucial and essential part of that park's ecosystem?
a. trees b. birds c. mammals d. insects