Final answer:
An earthquake of magnitude 8.0 on the Richter scale occurs about once every year is NOT true.
Step-by-step explanation:
The statement that is NOT true is: An earthquake of magnitude 8.0 on the Richter scale occurs about once every year. This statement is incorrect because earthquakes of magnitude 8.0 on the Richter scale are relatively rare and occur on average once every one to two years.
An earthquake of magnitude 4 on the Richter scale is 100 times greater than an earthquake of magnitude 2. This statement is true. The Richter scale is logarithmic, meaning that each whole number increase on the scale represents 10 times more ground motion.
Earthquakes occur when rocks of the asthenosphere rupture along a fault. This statement is also true. Earthquakes are caused by the movement and rupture of rocks along geological fault lines.
The Ring of Fire describes a geological circle on Earth where earthquakes are likely to occur. This statement is true. The Ring of Fire is a major area in the basin of the Pacific Ocean where a large number of earthquakes and volcanic eruptions occur.
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