Answer:
Revenues from petroleum.
Explanation:
Oil or petroleum exports are the main source of revenue and foreign exchange earnings for the Nigerian state. Nigeria had a GDP of $376.4 billion in 2017. Industry makes for 22.5 % of the GDP (2017).
Thee true statement is that Earthquake magnitude is based on ground motion recorded by a seismograph; intensity is based on the amount of damage produced.
<h3>How is the magnitude of an earthquake known by a seismograph?</h3>
The Richter magnitude of an earthquake is known to be seen through the use of the logarithm of the amplitude of waves as recorded by a seismographs.
The different Adjustments rates are included for the variation that exist between the distance from various seismographs and the epicenter of the earthquakes.
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