Effects of Weathering and Erosion. Volcanoes

Volcanoes form near the ​ (a)   zones of ​ (b)   boundaries, at diverging boundaries, and at ​ (c)   .

• subduction
• converging
• hot spots

Volcanoes form near the subduction zones of converging boundaries, at diverging boundaries, and at hot spots. ​ (a)   is underground molten rock, present before and during a ​ (b)   .​ (c)   is the molten rock ejected onto Earth's surface during an eruption.

• Magma
• volcanic eruption
• Lava

When an oceanic plate and a continental plate converge, the more dense oceanic plate sinks and is pulled beneath the less dense continental plate. This region is called a

• subduction zone
• tectonic plate boundary
• rift zone
• transform fault

When an oceanic plate and a (a)   plate converge, the more dense oceanic plate ​ (b)   and is pulled beneath the less dense continental plate. This region is called a (c)   . The resulting friction produces earthquakes and heat, which melts crustal rocks and forms (d)   and produces violent eruptions. Felsic magma is viscous (flows slowly), rich in lighter minerals such as feldspar and quartz, and is often light in color. (e)   forms from felsic magma.

• continental
• subduction zone
• felsic magma
• Granite
• sinks
• rises

felsic magma

• Felsic magma is associated with the formation of basaltic rocks.
• Felsic magma is primarily composed of iron and magnesium.
• Felsic magma is silica-rich magma associated with explosive eruptions.
• Felsic magma is low in silica and leads to gentle eruptions.

Felsic magma is viscous (flows slowly), rich in lighter minerals such as _____ and _____, and is often light in color.

• gabbro and diorite
• obsidian and limestone
• basalt and granite
• quartz and feldspar

forms from felsic magma.

• Basalt
• Granite or Rhyolite
• Andesite
• Diorite

Explosive volcanoes from viscous magma form near ​ (a)   , inland from convergent ​ (b)   plate boundaries.

• subduction zones
• oceanic-continental

When magma reaches earth's surface, it creates a

• trench

• volcano

• canyon

• sandy beach

Tags

NGSS.MS-ESS2-2

The volcanoes on the Hawaiian Islands form due to which of the following?

• Divergent Boundary

• Hot Spot

• Subduction Boundary

• Transform Boundary