12. This is formed by the
accumulation of lava that
oozes out from the
volcano. Since non-
viscous lava can flow
freely, a broad, slightly
doomed structure that
resembles a
is formed.
13. This is formed by the
accumulation of lava that
oozes out from the
volcano. Since non-
viscous lava can flow
freely, a broad, slightly
doomed structure that
resembles a
is formed.
Mauna Loa in Hawaii
14. This is built from ejected
lava fragments. They
have a steep slope, wide
crater, and is most
abundant of the three
major volcanoes
15. This is built from
ejected lava
fragments. They
have a steep slope,
wide crater, and is
most abundant of
the three major
volcanoes
Paricutin in Mexico
16. Also known as
stratovolcano. This is
large nearly perfect
sloped structure
formed from the
alternate
solidification of both
lava and pyroclastic
deposits.
17. Also known as
stratovolcano. This is
large nearly perfect
sloped structure
formed from the
alternate
solidification of both
lava and pyroclastic
deposits.
18. Also known as
stratovolcano. This is
large nearly perfect
sloped structure
formed from the
alternate
solidification of both
lava and pyroclastic
deposits.
Good day ! Students,. First of all I want to congratulate everyone because we are now halfway completing grade 9 science. We are now in quarter 3 which is all about earth science. Our first lesson in this quarter is all about the different types of volcano. This is our learning objectives.
So listen carefully and keep on watching
Before we start let us have some unlocking of difficulties. Let us define some terms that you will encounter let us define what volcano is
Have you seen mayon volcano located in albay, bicol, Philippines? Did you know that mayon volcano is one of the world’s most active volcano and it is very popular because of its perfect cone. Volcano has three basic parts namely the base, slope and summit where the crater or opening is located. Speaking of crater
It is the mouth or the opening of the volcano.
Do you know this volcano this is taal volcano located in Batangas, Philippines. This volcano has 47 craters. Amazing ! Right?
A caldera collapse is usually triggered the emptying of the magma chamber beneath the volcano as a result of a large volcanic eruption
When we say magma it a hot fluid or semi fluid material below or within earths crust that is usually made from molten rocks. When the magma ejected out of a volcano it is now called lava.
Lava is an Italian word which means to slide which is molten rocks does, once it reaches the surface
Now, let us proceed to the different types of volcano, Volcanoes can be classified according to its shape and according to its eruption. Let us have first the types of volcano according to its shape.
The first type is shield volcano. That is why it is called shield volcano because it looks like a warrior’s shield
Example is Mauna Loa in Hawaii
The second type is cinder cone volcano. It is also known as scoria cone
Example is mt. Paricutin in Mexico. As you can see it has a steep slope and has a wide crater that are characteristics of a cinder cone
Lastly we have composite volcano
According to volcanologist or the people who study about volcanoes some of the earth’s grandest mountain are composite or stratovolcano
One good example is our very own mayon volcano. And those are the three type of volcano according to its shape.
Again we have shield volcano, cinder cone volcano and composite volcano but why do volcanoes have different types it is because the process of magma formation is different at each type of plate boundary, therefore the composition of magma differs in each tectonic setting.
Now let us proceed to the types of volcano according to its eruption
It is also known as hydrothermal. Phreatic eruption is a type of eruption that happens in taal volcano last January 12, 2020
Next we have phreatomagmatic. Unlike phreatic that happens because hot rocks come in contact water. Phreatomagmatic eruption happens if there’s an interaction between water and magma. Resulting to a violent fine ash eruption
The third is strombolian
It is intensely violent kind of eruption that happens to mt. Pinatubo year 1991 again the 5 types of volcanic eruptions are
More over we can also classify volcano according to its record of eruption. Active volcano, a volcano is active if it has a record of eruption on the otherside a volcano is inactive if it shows no activity an no record of eruption just like mt. kanlaon in negros occidental, Philippines . We’re going to discuss more about this on our next lesson. To end our lesson we can thank volcanoes for life on earth to put simply volcanoes keep the earth warm and wet which are two critical elements for sustaining life
