Examlex
The annual mean temperature is an average of the twelve monthly means.
Underground Economy
Economic activities that occur outside of official regulation or taxation systems, often including undocumented labor and illegal trade.
National Income Accounting
A system of accounts that countries use to measure the overall economic activity and the total income of their citizens.
Natural Resources
Raw materials and resources provided by nature without human intervention, crucial for economic production, such as minerals, forests, and water.
Base Year
The year with which other years are compared when constructing an index; the index equals 100 in the base year.
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Q55: Spreading center volcanism most generally produces rocks