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Geotectonics - Geography GK Objective Questions with Answers

Questions
26 A hole in Earth's crust through which magma comes to Earth's surface is known as
A Crater
B Vent
C Cone
D Pipe

Answer: Option [B]

A hole in Earth's crust through which magma comes to Earth's surface is known as Vent. A volcano is a vent in the Earth's crust through which molten material under the Earth erupts suddenly.

27 Layers of volcanic materials that build up around vent to form a cone-shaped structure are known as
A Crater
B Vent
C Cone
D None of the above

Answer: Option [C]

Layers of volcanic materials that build up around vent to form a cone-shaped structure are known as Cone. Cone is the structure of the volcano formed as a heap of cooled materials that come out of volcanic eruptions

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28 Fluidity of lava is determined by amount of
A silica
B copper
C iron
D zinc

Answer: Option [A]

Fluidity of lava is determined by amount of silica.

29 Top of magma is forced onto Earth's surface is known as
A Pipe
B Cone
C Vent
D Crater

Answer: Option [D]

Top of magma is forced onto Earth's surface is known as Crater.

30 Volcanoes that have erupted in historic times and are still likely to erupt, are known as
A Instinct volcanoes
B Active volcanoes
C Dormant volcanoes
D Extinct volcanoes

Answer: Option [C]

Volcanoes that have erupted in historic times and are still likely to erupt, are known as Dormant volcanoes. Volcanoes are classified as active, dormant, or extinct. Active volcanoes have a recent history of eruptions; they are likely to erupt again. Dormant volcanoes have not erupted for a very long time but may erupt at a future time. Extinct volcanoes are not expected to erupt in the future.

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