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Volcano Eruptions
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NASA Why? Files segment describing volcanic activity and the Ring of Fire.
Hi, you must be the Treehouse Detectives.
00:00:00
And you are Dr. Peary?
00:00:03
I'm afraid so.
00:00:05
What's that plane behind you?
00:00:06
I've never seen anything like that before.
00:00:08
Well, it's an ER-2. It's a NASA research aircraft used at high altitude.
00:00:10
What kind of research does NASA do with this plane?
00:00:14
Well, this plane has high-powered cameras, and they can see a wide variety of phenomena,
00:00:16
including hurricanes, volcanoes, earthquakes, and it can also monitor ozone.
00:00:21
You mean you actually fly into a volcano when it's erupting?
00:00:26
Oh, no. It would do a lot of damage to an airplane like this.
00:00:30
But how can this cause damage?
00:00:33
Well, this isn't so much the problem.
00:00:35
This lava rock gets ground up into fine particulate material like this.
00:00:37
This is volcanic ash. This is the problem.
00:00:41
That's really light.
00:00:43
Where are most of the volcanoes located?
00:00:44
There are active volcanoes in every ocean basin on almost every continent in the world.
00:00:47
Most volcanoes are underwater and form along ridges as ocean basins spread away from them.
00:00:51
Sometimes volcanoes form in the middle of continents and ocean basins as hot spots heat up plates.
00:00:56
Plates?
00:01:02
The Earth's crust is actually broken into pieces that we call plates.
00:01:03
In fact, another place where volcanoes form is where one plate goes underneath another plate,
00:01:06
and that happens in the Pacific Ocean.
00:01:10
Are you talking about the Ring of Fire?
00:01:12
The Ring of Fire is a ring of volcanoes that surround the Pacific Ocean where the continents meet the ocean basin.
00:01:14
We learned that Mount Luminous is a cinder cone.
00:01:20
Could you tell us more about cinder cones?
00:01:22
Sure.
00:01:24
For instance, when cinder cones form, the magma is so sticky that the gas stays trapped inside it
00:01:25
until the pressure builds so much that it just literally explodes.
00:01:30
When it explodes, it forms lots of pyroclastic material, which is really sharp.
00:01:34
Maybe we're getting a little closer.
00:01:40
Thanks, Dr. Peary.
00:01:42
We learned so much about volcanoes.
00:01:43
Well, I hope this information gives you your answer.
00:01:46
Thank you so much.
00:01:48
Good luck.
00:01:49
Bye.
00:01:50
Bye-bye.
00:01:51
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- Idioma/s:
- Niveles educativos:
- ▼ Mostrar / ocultar niveles
- Nivel Intermedio
- Autor/es:
- NASA LaRC Office of Education
- Subido por:
- EducaMadrid
- Licencia:
- Reconocimiento - No comercial - Sin obra derivada
- Visualizaciones:
- 350
- Fecha:
- 28 de mayo de 2007 - 15:32
- Visibilidad:
- Público
- Enlace Relacionado:
- NASAs center for distance learning
- Duración:
- 01′ 51″
- Relación de aspecto:
- 4:3 Hasta 2009 fue el estándar utilizado en la televisión PAL; muchas pantallas de ordenador y televisores usan este estándar, erróneamente llamado cuadrado, cuando en la realidad es rectangular o wide.
- Resolución:
- 480x360 píxeles
- Tamaño:
- 11.29 MBytes