Origin of Magma

Most volcanoes form along what boundaries?

• Divergent

• Convergent

• Transform

• Divergent and Convergent

At convergent boundaries rocks...

• Slide past each other

• Move away from each other

• Move towards each other

At divergent plate boundaries rocks....

• Slide past each other

• Move towards each other

• Move away from each other

Where does magma form?

• Crust

• Upper mantle

• Upper mantle and crust

• Asthenosphere

Tags

NGSS.MS-ESS2-1

What factors influence magma formation?

• Heat

• Pressure

• Water content

• All of the above

Tags

NGSS.HS-ESS2-3

How does pressure change with depth?

• It decreases

• It does not change

• It increases

How does higher water content affect the rock's melting point?

• Water lower's the rock's melting point

• Water raises the rock's melting point

• Water actually has no affect on melting point

What is the ring of fire?

• The section of the volcano which the most activity takes place in

• A section along the pacific ocean where a hot spot of volcanoes are located.

• The most deadly volcano in the world

Tags

NGSS.MS-ESS3-2

Which continents does the ring of fire span across?

• Africa, Europe, North america, South America.

• Africa, Asia, Europe

• North America, South America, Australasia, Asia.

Which term describes the "decreased pressure that lowers the melting point of rocks" deep in the Earth?

• decompression melting

• divergence

• pressure melting