Content Starts Here
lava
Encyclopaedia Search
Lava
, Iceland. The volcano last erupted in 1973, ejecting magma, rocks, ash, and soot. The slopes have since stabilized, allowing plants to grow there once again. Moss and lichen can be seen on the rocks in the foreground.', copy:'(Image © Garret Nagle)'});)
 – are sometimes called cold deserts.', copy:'(Image © Garret Nagle)'});)
'});)
'});)
'});)
'});)
 and a comparatively high proportion of calcium (as feldspar) and magnesium (as pyroxene).', copy:'(Image © National Oceanic and Atmospheric Administration/Department of Commerce)'});)
'});)
'});)
'});)
'});)
Click images to enlarge
Molten magma that erupts from a volcano and cools to form extrusive igneous rock. Lava types differ in composition, temperature, gas content, and viscosity (resistance to flow).
The three major lava types are basalt (dark, fluid, and relatively low silica content), rhyolite (light, viscous, high silica content), and andesite (an intermediate lava).
© Research Machines plc 2008. All rights reserved. Helicon Publishing is a division of Research Machines plc.
Advertisement starts
Advertisement ends
atmosphere (earth science)
basalt
calcium carbonate
calcium hydroxide
carbon cycle
carbon dioxide
carbonate
cementation
chalk (rock)
chemical weathering
coastal erosion
composite volcano
conglomerate (geology)
continental drift
core (earth science)
crust
earthquake
erosion
evaporation
exfoliation
extrusive rock
fault
fertilizer
fold
fossil
freeze–thaw
global warming
gneiss
granite
gravel
greenhouse effect
helium
hot spot
igneous rock
intrusive rock
krypton
lava
limestone
lithosphere
magma
mantle
marble
metamorphic rock
metamorphism
mineral
neon
nitrate
nitrogen
nitrogen cycle
ocean
oxygen
physical weathering
plate
plate tectonics
plutonic rock
pollution
Precambrian era
rock
rock cycle
sandstone
schist
seafloor spreading
seawater
sediment
sedimentary rock
shale
shield volcano
silica
slate
soil
volcano
water
water cycle
water pollution
weathering
basalt
calcium carbonate
calcium hydroxide
carbon cycle
carbon dioxide
carbonate
cementation
chalk (rock)
chemical weathering
coastal erosion
composite volcano
conglomerate (geology)
continental drift
core (earth science)
crust
earthquake
erosion
evaporation
exfoliation
extrusive rock
fault
fertilizer
fold
fossil
freeze–thaw
global warming
gneiss
granite
gravel
greenhouse effect
helium
hot spot
igneous rock
intrusive rock
krypton
lava
limestone
lithosphere
magma
mantle
marble
metamorphic rock
metamorphism
mineral
neon
nitrate
nitrogen
nitrogen cycle
ocean
oxygen
physical weathering
plate
plate tectonics
plutonic rock
pollution
Precambrian era
rock
rock cycle
sandstone
schist
seafloor spreading
seawater
sediment
sedimentary rock
shale
shield volcano
silica
slate
soil
volcano
water
water cycle
water pollution
weathering
Related Links
Turkmenistan Flag
The stars represent the five regions of Turkmenistan. The crescent symbolizes Islam. Effective date: 19 February 1997.
>>
Advertorial
Find out how to buy the things you've always wanted and sell the things you don't on ebay.
Font size
Mail
My account
Help
Community
Print now
Send to a friend
Related articles
Related products
