The Ring of Fire
The Ring of Fire
What is a horseshoe-shaped belt of volcanic and earthquake activity around the Pacific Ocean.
The two main types of basaltic lava
What is Pahoehoe and aa.
This happens when an oceanic plate subducts into the mantle
What is it heats up and begins to melt.
A hotspot
What is a region in Earth’s mantle with unusually hot rock that creates volcanoes.
This type of volcano is formed by basaltic lava
What is a Shield volcano.
Percentage of the Earth’s active volcanoes are in the Ring of Fire
What is about 75%.
The difference between pahoehoe and aa lava.
What is Pahoehoe has a smooth, ropy surface; aa has a rough, jagged surface.
This forms when molten rock rises into the crust after subduction
What are Magma chambers.
Hawaii is volcanic even though it’s far from a plate boundary because
What is it sits above a mantle hotspot.
This type of volcano forms from andesitic eruptions
What is Composite cone.
Most volcanoes occur in the Ring of Fire
Because many are located along subduction zones where oceanic plates sink under continental plates.
Type of landscape is formed by lava from fissure eruptions
What is Plains or plateaus.
Subduction causes volcanic activity because
What is the melting crust forms magma that rises to the surface, forming volcanoes.
This Hawaiian island is currently over the hotspot
What is the Big Island (Hawaii).
Shield volcanoes differ from composite cones because
What is Shield volcanoes are broad and gently sloping; composite cones are steep and explosive.
The cause of the earthquakes and volcanic activity around the Ring of Fire
What is the movement and subduction of tectonic plates.
Pillow lava and how it forms
What is lava that erupts underwater and solidifies in pillow-shaped masses.
The process that leads to the creation of magma
What is Partial melting.
The age of Hawaiian Islands change from southeast to northwest because
What is they get older as you move northwest.
This is a caldera
A large volcanic crater (≥1 km) formed when a volcano’s summit collapses.
The type of plate boundary is most common in the Ring of Fire
What is Convergent boundaries (subduction zones).
Pillow lava in ancient rocks tell scientists this
What is that the rocks formed under water.
Subduction zones often sites of active volcanoes because
What is because melting of the subducted plate provides magma for eruptions.
Older Hawaiian volcanoes become extinct Because
What is the Pacific Plate moves them away from the hotspot.
Caldera is different from an ordinary crater because
What is A caldera forms from collapse after eruption; a crater’s roof remains intact.