a meteorite impact
Explanation:
What most likely cause the bowl - like structure is a meteorite impact.
This is can be deduced from the presence of iridium and bowl - like structure on the earth.
Iridium has a higher abundance in meteorite than the normal crustal abundance.
During a meteorite collision on the surface, it is often encounter in craters.
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Friction depends partly on the smoothness of the contacting surfaces, a greater force being needed to move two surfaces past one another if they are rough than if they are smooth.