C. It decreases in wave speed.
<span>Period of a wave is the time needed for one complete cycle of vibration to pass a given point. Frequency and period have a reciprocal relationship. Frequency can be similarly thought of as speed of a wave.</span>
The Great Recession was a global economic downturn that devastated world financial markets as well as the banking and real estate industries. The crisis led to increases in home mortgage foreclosures worldwide and caused millions of people to lose their life savings, their jobs and their homes.
<span>Eratosthenes coined the term geography/</span>
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