Download Volcanoes

Volcanoes
Miss Holdstein
6th Grade Science
Standards Addressed
•
•
Students know evidence of plate tectonics is derived
from the fit of the continents; the location of
earthquakes, volcanoes, and midocean ridges; and the
distribution of fossils, rock types, and ancient climatic
zones.
Students know earthquakes, volcanic eruptions,
landslides, and floods change human and wildlife
habitats.
Volcanic Eruptions
There are two types of
volcanic eruptions:
• Non-explosive
• Explosive
Non-explosive Eruptions
• Most common type of volcanic eruption.
• Produces lava flows, relatively calm
outpourings of lava.
• Many of the largest mountains on Earth
have been formed as the result of lava
flows from repeated non-explosive
eruptions over hundreds of thousands of
years.
Non-explosive eruption
Explosive Eruptions
• Clouds of hot debris and gases shoot out
from the volcano.
• No lava flow, instead molten rock is blown
into millions of pieces that harden in the
air.
• An explosive eruption can blast millions of
tons of rock from a volcano, demolishing
rock formations that took thousands of
years to form.
Explosive Eruption
Volcano Video
References
• Text- Holt Earth Science California edition
• Photos & Video:
– Explosive eruption (www.ime-usa.com/.../
guagua_eruption_lg.jpg )
– Non-explosive eruption (library.thinkquest.org/
J001393/volcanoes/3.htm)
– Video (www.volcanolive.com)