During Reconstruction in the United States, the Freedmen’s Bureau helped African Americans relocate from the South to the North. administered poll taxes and literacy tests during elections. negotiated labor contracts between laborers and employers. segregated white and African American students in schools.

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a plantation economy is an economy based on agricultural mass production, usually of a few commodity crops grown on large farms called plantations. plantation economies rely on the export of cash crops as a source of income.

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incident infrared radiation is blocked. visible and ultraviolet radiation heat   earth.

earth radiates infrared radiation. infrared radiation is blocked and heats earth. visible and shortwave radiation heat earth.

earth radiates longwave radiation

longwave radiation is reflected downward longwave radiation heats earth