Answer:
Two possible reasons for the massive extinction at the end of the Paleozoic Era are an asteroid collision and massive volcanic eruptions.
Explanation:
The massive extinction that occurred at the end of the Paleozoic Era is the biggest extinction from what is known so far. The majority of the species died out, and whole families of animals and plants were wiped out of the face of the Earth. It was only small and highly adaptable organisms that managed to survive and give rise to the later life-forms.
The two possible reasons for this massive extinction are an asteroid impact and massive volcanic eruptions. An asteroid collision would have created drastic changes in a matter of minutes and hours, with effects lasting for a long period of time, thus eliminating the majority of the life. Massive volcanic eruptions, with the Siberian super-volcano being the prime candidate, may have caused enormous amounts of carbon dioxide and sulfur dioxide to end up in the atmosphere, thus rapidly changing the living conditions on the planet.
Well one possible reason could be because it could ruin the land. When land focuses on the mass production of a certain crop, the land loses essential nutrients and will deteriorate overtime.
They occur along a fault line or where two tectonic plates meet
Answer:
I really don't know if this is what your looking for. Or what kind of speed review your talking about. Sorry if this is wrong. I tried
form a mountain chain requires converging plates
sedimentary rock requires oceanic crust
so the ans is B. convergent boundary of oceanic crust and continental crust
