1. What has produced the oxygen in Earth’s atmosphere? 2. How does the increasing abundance of CO…

1. What has produced the oxygen in Earth’s atmosphere? 2. How does the increasing abundance of CO2 in Earth’s atmosphere cause a rise in Earth’s temperature? 3. Why would a decrease in the density of the ozone layer cause public health problems? 4. Why doesn’t Earth have as many craters as the moon?  

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