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Unit 8
Volcanoes
| Question | Answer |
|---|---|
| What is the relationship between the amount of gases in magma and the explosiveness of a volcanic eruption? | The more gases, the bigger the explosion. |
| What is the relationship between the silica content of magma and the explosiveness of a volcanic eruption? | The more silica, the larger the explosion. |
| Which type of eruptions are characterized by very fluid lava and very little explosive activity? They are also the quietest. | Hawaiian eruptions. |
| What is a Strombolian eruption? | A semi-violent eruption. They were named after the Stromboli volcano in Italy, they have thicker lava flows and some small explosions. |
| These eruptions have large explosions of ash and rock, which rise in dark clouds. | Vulcanian eruptions. |
| What is a Pelean eruption? | An eruption which can cause great destruction and loss of life. Example - Mount Pelee |
| What is magma? | Melted rock formed by heat and pressure deep inside the earth. |
| What is a steep-walled depression around a volcano's vent? | A Crater. |
| What is an opening in Earth's surface through which magma flows? | Vent |
| An opening in Earths surface that often forms a mountain when layers of lava and volcanic ash erupt. | Volcano |
| Area between mantle and core where hot rock is forced into the crust. | Hot Spot |
| This causes rocks to melt and form magma? | Heat and pressure |
| Places where most volcanoes occur? | Plate boundaries |
| These two factors control whether an eruption will be explosive or quiet? | Water vapor and silica |
| Magma that is low in silica and produces nonexplosive eruptions is called? | basaltic |
| Magma that is high in silica and produces explosive eruptions is called? | granitic |
| Bits of rock dropped from the air during the eruption of a cinder cone volcano are called? | tephra |
| If the top of a volcano collapses, it may form a large opening called a ? | caldera |
| Ship Rock in New Mexico is an example of a? Also, when erosion wears a volcanic cone away, it leaves behind this... | Volcanic Neck |
| The granite domes of Yosemite National Park are the remains of a large? | batholith |
| Are the eruptions of cinder cone volcanoes quiet or explosive? | explosive |
| What type of material makes up volcanoes with borad, sloping sides? | lava |
| What type of volcano is made of lava, volcanic ash, and cinders? | composite |
| A broad volcano with gently sloping sides? | Shield |
| Bits of rock or solidified lava dropped from the air? | Tephra |
| Volcano type with steep sides? | Cinder cone |
Created by:
Klosseff
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