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.
(1) convection occurs in substances that flow.it can be initiated by uneven heating. (2) in the mantle convection of hot rock creates plumes which move tectonic plates. in the outer core convection causes magnetism. (1) is your first question and (2) is your second. hope this helps! :)
The movement is called convection, where warm material rises, then cools, then sinks back down.
B) Situational Characteristics
By seismic waves that are inscribed all over the surface of the earth from distance earthquakes.
