93497
Description
Mind Map by hannah_louisa, updated more than 1 year ago
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Created by hannah_louisa
over 11 years ago
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Intrusive and Extrusive Activity
- Intrusive
- Batholith
- large chambers of magma cool
underground and form domes of
igneous rock
- large chambers of magma cool
underground and form domes of
igneous rock
- Dykes and sills
- magma flows into gaps in the
surrounding rock, cools and forms
vertical dykes and horizontal sills
- magma flows into gaps in the
surrounding rock, cools and forms
vertical dykes and horizontal sills
- Cooling
Cracks
- cracks may form as
the magma cools
- cracks may form as
the magma cools
- Batholith
- Extrusive
- Lava Eruptions
- Basaltic lava - Constructive
- temperature of eruption over 950
- flows easily and gas can escape easily.
eruptions aren't violent, usually frequently
and long periods
- temperature of eruption over 950
- Andesitic and Rhyolitic - Destructive
- 750-950 degrees eruption. rhyolitic is less than 750
- flow less easily and often have blockages. gases
can't escape so pressure build and the blockage
is cleared by a violent eruption. short lived and
intermittent
- 750-950 degrees eruption. rhyolitic is less than 750
- Basaltic lava - Constructive
- Volcanos
- Dome- Destructive. lava is rhyolitic or andesitic. thick
lava causes steep sides as it flows shorter distances
- Caldera- Destructive. andesitic and
rhyolitic. central part collapses as the
magma chamber below empties
- Shiled- Constructive.
Basaltic lava. long linear
vent can be several km
long
- Dome- Destructive. lava is rhyolitic or andesitic. thick
lava causes steep sides as it flows shorter distances
- Hot Springs
- places where groundwater emerges at
the surface. if the source is close to an
area of recent intrusive activity the water
is heated and becomes a hot spring
- temperature varies from 20-90
degrees. tourist attractions
- places where groundwater emerges at
the surface. if the source is close to an
area of recent intrusive activity the water
is heated and becomes a hot spring
- Geysurs
- type of hot spring here hot water
and steam are ejected from the
surface in a fountain.
- groundwater is heated above boiling
point by magma in the crust
- hot water becomes pressurised
and forces its way to the
surface
- type of hot spring here hot water
and steam are ejected from the
surface in a fountain.
- Boiling mud pool
- another hot spring, form in areas with fine
grained soil, water mixes with the soil to make
a hot muddy pool
- another hot spring, form in areas with fine
grained soil, water mixes with the soil to make
a hot muddy pool
- Lava Eruptions
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