Earth structure
What are the two types of crust?
Oceanic crusts and Continental crust
Do Tectonic plates move
Yes, they move
What is a volcano hotspot?
region deep within the Earth's mantle
What is magma?
Hot fluid that is made out of melted rock, that is spewed
What is a volcano?
A breakage in the earth's crust that allows magma to escape.
What are the four major layers on the Earth's core?
Crust, Mantle, Inner Core, Outer Core
What causes the plates to move?
Forces, gravity and hard rock and explosive gases
Where are the most active volcanoes located
Kilauea volcano on Hawaii is the world's most active volcano, followed by Etna in Italy and Piton de la Fournaise on La Réunion island.
How do volcanoes erupt?
Magma, Forms where ocean water is, and then lowers the layers melting point.
How many types of major volcanoes are there?
There are 4.
what is "rock strength"?
Keeps magma in place so it doesn’t go over the crust, but when the rock strength is not enough and when the lithomatic pressure and magma-static pressure is uneven it erupts
How many major tectonic plates are there?
There are 7.
how many volcanic eruptions occur every year
about 50-70
What happens when a volcano erupts?
Ash is spewed out and so is magma
What is the asthenosphere?
It is a Rocky portion of earth which is under the lithosphere in the upper mantle.
What are the three types of plate boundaries called?
Convergent boundaries = plates move one another
Divergent boundary = plates move away from each other
Transform/conservative boundaries=plates move sideways
What causes a volcano eruption?
High pressure gas bubbles exploding,
Rock layer not strong enough to hold the magma below it can corrode rock (hydrothermal alteration) ]
Name all the main different types of volcanoes
shield, cinder cone, stratovolcano and one more unnamed type
What is the term for the rising and falling heat cycle of the earths core?
Convection currents
Name the 7 major tectonic plates
African, Antarctic, Eurasian, Indo-Australian, North American, Pacific and South America
What type of volcano is Mount tambora?
Stratovolcano