Garbage dumped in sinkholes can pollute the groundwater supply
<span> What substance was responsible for a major ozone depletion in the 1900s? </span>
<span>In the 1920s, CFCs were invented and widely used because they were not too expensive, and were inflammable. By the 1990s, they were banned because they depleted ozone, and the only place Nature could destroy them was the intense solar radiation in the ozone layer. </span>
Answer:
yes noob is it ok it is asking to keep 20 letters
Because Cyanobacteria appeared
Cyanobacteria's excrement formed a lot of oxygen in the atmosphere which make the earth temperature cold
This allow a liquid water to formed on the surface ( because if the temperature is too high, the water will evaporate) and eventually formed oceans
