Which of the following is an example of a physical change?
A. water being electrolyzed and being converted in hydrogen and oxygen
B. charcoal being converted into ash
C. a candy bar being digested by a student
D. water boiling and being converted into steam
E. iron metal reacting with oxygen to form rust
Answer: D
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A heavy ball hangs by a string, with a second string attached to its bottom (Figure 2.7 in your textbook). A quick pull on the bottom string breaks the
A. bottom string. B. top or bottom string equally likely. C. top string. D. none of the above
Which travels faster in a vacuum?
A. Light waves. B. Radio waves. C. both the same D. none of the above
Which of these minerals could be used to make glass windows?
A. gypsum B. hematite C. quartz D. clay minerals E. calcite
Sediments found on continental margins are called ________
A) continental B) estuarine C) neritic D) oceanic E) pelagic