When magma reaches the surface, what is it called?
What is lava.
100
About how long is the Ring of Fire?
About 25,000 miles long.
100
Quiet eruptions produce what type(s) of lava?
What is Pahoehoe and Aa.
100
What is a high, level area formed by lava seeping out of cracks.
What is lava plateaus.
100
The physical property of liquids. This determines how fast or how slow a liquid flows.
What is Viscosity.
200
What is magma?
A liquid, molten mixture of rock forming new substances, gases, and liquids from the mantle.
200
Where do volcanoes form?
What is along plate boundaries.
200
What type of volcano has a gentle slope?
What is a shield volcano.
200
Describe how a caldera form?
A volcano has an enormous eruption, causing the vent and the magma chamber to empty. Without the support, the top of the volcano's top collapses inward.
200
What property doesn't cause a change to the substance?
Physical Property
300
What type of magma has a higher viscosity?
What is Aa.
300
How many volcanoes does the Ring of Fire consist of?
What is 452 volcanoes.
300
An explosive eruption comes from which two volcanoes.
What is a cinder cone and composite volcanoes.
300
As the volcano dies the last bit of magma hardens, forming what?
What is a volcanic (volcano) neck.
300
A fixed place where material from deep in Earth melts forming magma.
Hot Spot
400
What type of lava forms sharp, jagged rocks?
What is Aa.
400
The Ring of Fire rims what ocean?
What is the Pacific Ocean.
400
What is an example of a quiet eruption's work.
What is the Hawaiian Islands.
400
How does a dike form?
When magma rises into existing cracks, forcing its way across rock layers, and than hardening.
400
What causes an eruption to be explosive or not?
What is the magma's silica and viscosity.
500
What type of lava looks like a large mass of wrinkles?
What is Pahoehoe.
500
What percent of Earth's volcanoes are active of dormant?
What is 75%.
500
What are some problems of quiet and explosive eruptions?
What is buries everything in it's path, sets fire to everything, deadly gases, if ash becomes wet roofs can collapse, avalanches/ mudslides, and airplane/ jet engines to stall.
500
A large mass of rock that form the core of many mountain ranges.
What is a Batholith.
500
What are the four ways a scientist can predicate an eruption?
1. tiltmeters
2. monitor gas escaping
3. temperature increase
4. the upward movement of magma may trigger small earthquakes near volcanoes