Volcanoes

For a volcano to form, there must be

• earthquakes

• magma

• transform and divergent boundaries

• a divergent and convergent boundaries

Volcanoes can erupt when mantle rock begins to melt. this can occur by an increase in temperature or a decrease in pressure, but in oceanic crust, the melting temperature is also lowered if _____ is introduced into the magma.

The Hawaiian islands formed as the Pacific Plate moves over a hotspot. A volcano that is directly over the hotspot would most likely be classified as:

• extinct

• active

• dormant

• cone

Mantle rock can melt to form _______ if the temperature rises, the pressure lowers, or water is added to the mantle.

Many volcanoes are found around the ________ basin.

• Atlantic Ocean

• Arctic Ocean

• Pacific Ocean

• Southern Ocean

___________ is a measurement of how resistant a liquid is to flowing. For instance, water has a very low ______, meaning it flows very easily while honey has a high ________, meaning it flows very slowly.

• Felsic

• Density
• Transparency
• Viscosity

Magma vs Lava

• Magma and lava are the same thing
• Magma is beneath the Earth's surface, while lava flows out of a volcano onto the Earth's surface.
• Magma is cooler than lava
• Lava is found beneath the Earth's surface

Mafic vs Felsic - Organize the Descriptions under the correct Category

Groups:

(a) Mafic Magma

,

(b) Felsic Magma

,

(c) Mafic Volcano

,

(d) Felsic Volcano

• Low explosivity

• High viscosity before cooling

• Oceanic rocks

• Continental rocks

• Low viscosity

• Found in Hawaii

• Very explosive due to a high silica content

• light in color

• High iron content

• Shield Volcanoes

• High Silicon content

• Dark in color

• Mt. St. Helen and Mt. Vesuvius are examples of this type of volcano.

• Tall and steep volcanoes

Tags

HS-ESS3-B-1