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Madeline- Volcanoes
1
Transcript
Volcanoes
By Madeline
How do volcanoes form?
How do volcanoes form?
- Volcanoes form at the edges of Earth’s tectonic plates.
- These huge slabs of Earth’s crust travel atop the partly molten mantle, the layer beneath the crust.
- I think that without volcanoes we wouldn't have the islands that we go to like Hawaii and the Caribbean
- A volcano is an opening in Earth’s crust
- They allow molten rock from beneath the crust to reach the surface.
What exactly do volcanoes do?
- The earth’s crust is composed of enormous sections of rock called tectonic plates.
- Tectonic plates and are constantly moving toward, against, and alongside one another.
- Volcanoes often form in the areas where tectonic plates make contact.
What are tectonic plates?
- The friction created by the movement between two plates can melt solid rock in the mantle and turn it into magma.
- This hot, molten rock creates great pressure, and over time, it finds its way up to the surface of the crust through fractures.
- Once magma reaches the surface of the earth, it is called lava.
How does lava form?
What is lava made up of?
What is lava made of?
- Lava is made up of
- crystals,
- volcanic glass, and
- bubbles
I find it difficult to think about how many volcanoes(that are active) have formed
- Lava is made up of crystals, volcanic glass, and bubbles (volcanic gases).
- As magma gets closer to the surface, it begins to crystallize minerals like olivine.
- The liquid "freezes" to form volcanic glass
Materials in lava in lava
Do you know what Volcanic Gasses are?
- When lava erupts it is made up of a slush of crystals, liquid, and bubbles.
- The gasses freezes and it creates volcanic glass
Gasses
Active Volcanoes Around the World
Where are active volcanoes in the world?
- The Ring of Fire is a series of volcanoes in the Pacific.
- About 75% of all the world’s active volcanoes are found there. (This BLOWS my mind)
This is where one of the worlds volcanoes is located
- Name: Kilauea
- Type: Basaltic Shield Volcano
- Latitude: 19.406
- Longitude: -155.283
This is one of Hawaii's hot spots. Pretty cool, right?
Where do they form?
- Volcanoes can also form in the middle of a plate where magma rises upward
- And then it erupts on the seafloor, at what is called a “hot spot."
- Hawaii was formed a long time ago from an underwater volcano
Volcanic Lighting
- Volcanic lightning occurs mostly within the cloud of ash during an eruption
- It is created by the friction of the ash rushing to the surface.
The reason I chose this topic is
I chose this topic because I find volcanoes very inserting and I think they are really cool
Thank You!
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