A weak spot in the crust where molten material or magma comes to the surface
What is a Volcano?
100
A substance that cannot be broken down into other substances
what is an element?
100
Lava begins as this
What is magma?
100
True or False:
Volcanic activity on and beneath the surface has built up Earth's land areas
True!
100
looks like a giant tooth stick in the ground
What is a volcanic neck?
200
Lava
When magma reaches the surface it is called this
200
when a substance reacted with another and changes colour, produces a gas, or forms a new solid substance
what is a chemical property?
200
connects the magma chamber to the Earth's surface
What is the pipe?
200
Name four landforms made from Lava and Ash
What are Shield Volcanoes, Cinder Cone Volcanoes, Composite Volcanoes and Lava Plateaus
200
Magma that forces itself across rock layers hardens
What is a dike?
300
True or False:
Volcanic belts form along the boundaries of Earth's plates
True
300
Give an example that explains how liquids differ in viscosity (some liquids flow more easily than others)
Is it true that the lower the viscosity, the more easily a liquid flows?
Honey vs. Oil.
Yes it is true.
300
A volcano that erupts quietly or explosively depends on high or low _____________ levels.
What is silica?
300
These volcanoes have quiet eruptions and gradually build up a gently sloping mountain.
What are Shield Volcanoes?
300
When magma squeezes between horizontal layers of rock, it forms a ___________
What is a sill?
400
What is a hot spot?
an area where material from deep within the mantle rises and then melts, forming magma. Some volcanoes result from hot spots.
400
These two (2) things determine the viscosity of magma
what is silica and temperature?
400
Describe a Pyrcoclastic flow
an explosive eruption that hurls out a mixture of hot gases, ash, cinders and bombs.
400
What form from enormous eruptions that may empty the main vent of the magma chamber beneath a volcano, resulting in a hollow shell.
What is a Caldera?
400
These large rock masses form the core of many mountain ranges and formed when a large body of magma cools inside the crust
What is a batholith?
500
This is a result of two oceanic plates colliding. Magma breaks through the ocean floor creating volcanoes.
What is an island arc?
500
True or False?
Pahoehoe is slow moving, hot lava that has high viscosity
False.
Pahoehoe is fast moving, hot lava that has low viscosity
500
What three terms describe the life cycle of a volcano?
What is more dangerous, a dormant or active volcano?
active, dormant and extinct.
dormant- people living near a dormant volcano may be unaware, and it can becomes active at anytime.
500
Geothermal energy was discussed in two forms. Please name them.
Which one forms when groundwater is heated by a nearby body of magma or by hot underground rocks?
Hot springs & Geysers
What are Hot springs?
500
Name two places where Geothermal energy provides electrical power
California and New Zealand- They both are close to the Pacific Ocean (Ring of Fire!!).