How does a hot spot form a chain of volcanoes?

• A hot spot moves under the plate as the plate continues moving.
• A hot spot remains in a fixed place in the mantle, but the plate continues moving.
• The mantle is continuously moving, and the hot spot moves in the opposite direction.
• The crust is constantly moving, but at a slower pace than the hotspot.

Which of the following descriptions below correctly describe a shield volcano? (Select all that apply)

• Also called a stratovolcano
• Builds up over a broad area
• Slow, steady eruptions
• Alternating layers of lava and ash
• Explosive eruptions of ash, cinder, and bombs

Which of the following descriptions below correctly describe a cinder cone volcano? (Select all that apply)

• Also called a stratovolcano
• Builds up over a broad area
• Slow, steady eruptions
• Alternating layers of lava and ash
• Explosive eruptions of ash, cinder, and bombs

Which of the following descriptions below correctly describe a composite volcano? (Select all that apply)

• Also called a stratovolcano
• Builds up over a broad area
• Slow, steady eruptions
• Alternating layers of lava and ash
• Explosive eruptions of ash, cinder, and bombs

Arjun, Aria, and Harper are on a field trip to the island of Hawaii. They notice that sometimes thin, runny lava actually flows from the volcanoes there. What type of volcanoes are they observing?

• cinder cone

• shield

• composite

• lava plateaus

Which of these instrument readings indicates that the volcano might erupt?

• The sulfur dioxide emissions are increasing.
• The rumblings from the volcano are decreasing.
• A spectrometer reading shows fewer gas emissions.
• Tiltmeter readings show that the volcano sides have stayed the same.

The high silica magma is more ______________ and is more likely to produce a(n) ______________ eruption.

• sticky / explosive
• runny / explosive
• sticky / quiet
• runny / quiet

The low silica magma is more ______________ and is more likely to produce a(n) ______________ eruption.

• sticky / explosive
• runny / explosive
• sticky / quiet
• runny / quiet

What is one cause for the formation of a shield volcano?

• earthquake
• caldera
• hot spot
• lava plateau

Runny lava oozes from the vent of a broad, gently-sloping shield volcano. What type of eruption is this?

• Quiet eruption
• Explosive eruption
• Neither