#RFB-11000816Reading: Fill in the BlanksAcademic,CoreMedium

Desertification

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The deserts, which already [blank] approximately a fourth of the Earth's land surface, have in recent decades been [blank] at an alarming pace. The expansion of desert-like conditions into areas where they did not [blank] exist is called desertification. It has been estimated that an additional one-fourth of the Earth's land surface is [blank] by this process.

Sample Answer & Audio Transcript

The deserts, which already occupy approximately a fourth of the Earth's land surface, have in recent decades been increasing at an alarming pace. The expansion of desert-like conditions into areas where they did not previously exist is called desertification. It has been estimated that an additional one-fourth of the Earth's land surface is threatened by this process.
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