Answer:
Do you mean crosscutting??
Explanation:
The law of Crosscutting tells you that when one geologic structure cuts through another, the structure that was cut is older than the one that cut through it.
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
Answer:
is the only mass extinction event to have occurred
Explanation:
It should be pluto because pluto is a darft planet