Our galaxy consists of a large, nearly flat ____ with a central ____ , all surrounded by a vast ____ .
Fill in the blank(s) with the appropriate word(s).
Answer: disk; bulge; halo
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Which of the following is an example of a scientific law?
A. A spaceship in space reaches a certain velocity and then cuts off its engine. It will travel for millions of miles unless acted upon by another force or body. B. You are driving down a section of highway that is perfectly level (no hills or valleys) at 60 miles per hour. You take your foot off of the accelerator and coast for 100 miles. C. Pennies dropped off a 1000-foot high building travel faster than pennies dropped out of a plane at 1000 feet above the ground. D. A bullet fired on Saturday always goes farther than one fired the next day (Sunday) using the same gun at the same temperature.
One way to study development is by proportion of economic activity in "sectors." The sector concerned with information based services is referred to as
A. primary B. secondary C. tertiary D. quaternary
The majority of lightning strikes occur within the cloud, while only about ____ percent or so occur between cloud and ground.?
a. ?5 b. ?10 c. ?15 d. ?20 e. ?25
Belgium is divided ethnically into a Dutch-speaking north and a French-speaking south. Because one group or the other has been seeking greater autonomy, Belgium is an example of a country plagued by:
A) civil war B) "Trabis" C) genocide D) separatist movements