There was no protective ozone layer early in Earth's history, which allowed Earth's surface to be bombarded with ultraviolet radiation.

Name: There was no protective ozone layer early in Earth's history, which allowed Earth's surface to be bombarded with ultraviolet radiation.
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Question

Quizplus · Accepted Answer

Early in Earth's history, the atmosphere lacked significant oxygen, and thus the protective ozone layer had not yet formed, allowing more ultraviolet radiation to reach the surface.

There Was No Protective Ozone Layer Early in Earth's History