#RFB-11000733Reading: Fill in the BlanksAcademic,CoreHard
Ozone
Official Question Material
Prep: Varies
Scientists have established records spanning several decades that [blank] normal ozone levels during natural cycles. Ozone concentrations in the atmosphere [blank] naturally with sunspots, seasons, and latitude. These processes are well-understood and [blank] . Beginning in the 1970s, however, scientific evidence showed that the ozone shield was being [blank] well beyond natural processes.
Sample Answer & Audio Transcript
Scientists have established records spanning several decades that detail normal ozone levels during natural cycles. Ozone concentrations in the atmosphere vary naturally with sunspots, seasons, and latitude. These processes are well-understood and predictable . Beginning in the 1970s, however, scientific evidence showed that the ozone shield was being depleted well beyond natural processes.
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