2 multiple choice 1 point mantle plumes generate magma by... partially melting the upper mantle partially or…

2 multiple choice 1 point mantle plumes generate magma by... partially melting the upper mantle partially or completely melting the overlying oceanic crust partially melting the overlying continental crust all of the previous 3 multiple choice 1 point basalt flows associated with a mantle plume beneath a continental plate are associated with which phase of the evolution of a mantle plume? early on, when it has just appeared and is very hot and is affecting a wide area of the overlying crust early on, when it has just appeared and is very hot and is affecting a small area of the overlying crust mid - stage, when it is still very hot but affecting a different area of the overlying continental crust late - stage, when the heat from the mantle plume is dissipating 4 multiple choice 1 point a 50 million year old mantle plume sits beneath a continental plate. the heat dissipating from the plume causes the overlying continental plate to partially melt. what will be the likely result? icelandic - style basalt flows strombolian eruptions, forming andesitic cinder cones infrequent ultra - plinian eruptions, forming rhyolitic calderas frequent plinian eruptions, forming rhyolitic stratovolcanoes 5 true or false 1 point after its early phases, a long - lasting mantle plume beneath a continent will not produce as frequent volcanic activity as a mantle plume beneath an oceanic plate. true false

2 multiple choice 1 point mantle plumes generate magma by... partially melting the upper mantle partially or completely melting the overlying oceanic crust partially melting the overlying continental crust all of the previous 3 multiple choice 1 point basalt flows associated with a mantle plume beneath a continental plate are associated with which phase of the evolution of a mantle plume? early on, when it has just appeared and is very hot and is affecting a wide area of the overlying crust early on, when it has just appeared and is very hot and is affecting a small area of the overlying crust mid - stage, when it is still very hot but affecting a different area of the overlying continental crust late - stage, when the heat from the mantle plume is dissipating 4 multiple choice 1 point a 50 million year old mantle plume sits beneath a continental plate. the heat dissipating from the plume causes the overlying continental plate to partially melt. what will be the likely result? icelandic - style basalt flows strombolian eruptions, forming andesitic cinder cones infrequent ultra - plinian eruptions, forming rhyolitic calderas frequent plinian eruptions, forming rhyolitic stratovolcanoes 5 true or false 1 point after its early phases, a long - lasting mantle plume beneath a continent will not produce as frequent volcanic activity as a mantle plume beneath an oceanic plate. true false

Answer

Brief Explanations:

  • For question 2: Mantle plumes generate magma mainly by partially melting the upper mantle. The other options about melting oceanic or continental crust are not the main way.
  • For question 3: Basalt flows associated with a mantle - plume beneath a continental plate are associated with the early stage when it has just appeared, is very hot and affects a wide area of the overlying crust.
  • For question 4: When a 50 - million - year - old mantle plume beneath a continental plate causes partial melting of the overlying plate, infrequent Ultra - Plinian eruptions forming rhyolitic calderas are a likely result.
  • For question 5: After its early phases, a long - lasting mantle plume beneath a continent will not produce as frequent volcanic activity as a mantle plume beneath an oceanic plate because of differences in crustal thickness and composition.

Answer:

  1. partially melting the upper mantle
  2. early on, when it has just appeared and is very hot and is affecting a wide area of the overlying crust
  3. Infrequent Ultra - Plinian eruptions, forming rhyolitic calderas
  4. True