The mass extinction at the end of the Ordovician period was probably caused by a. the collision of Earth with a large meteorite. b. massive volcanic eruptions. c. massive glaciation on the southern continents and associated climate changes. d. the coming together of the continents to form Pangaea. e. changes in Earth's orbit.
Added by James C.
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There is no strong evidence to support that a large meteorite collision caused the mass extinction at the end of the Ordovician period. b. Massive volcanic eruptions could have contributed to the mass extinction, but they are not considered the primary cause. c. Show more…
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The mass extinction at the end of the Ordovician period was probably caused by $a$. the collision of Earth with a large meteorite. b. massive volcanic eruptions. c. massive glaciation on the southern continents and associated climatic changes. $d$. the uniting of all continents to form Pangaea. e. changes in Earth's orbit.
The cause of the mass extinction at the end of the Mesozoic era probably was a. continental drift. b. the collision of Earth with a large meteorite. c. changes in Earth's orbit. d. massive glaciation. e. changes in the salt concentration of the oceans.
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