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24 Cards in this Set
- Front
- Back
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half-life
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The amount of time that it takes for one half of an original population of atoms of a radioactive isotope to decay.
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define silica rich magma composition
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thick
viscous traps escaping gas forms steep stratavolcanoes(the kind that was seen in joe versus the volcanoe) |
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what one important factor distinguishes a strato volcanoe from a shield volcanoe
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composition
strato= high silica content sheild = low silica content |
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stratification |
The accumulation of material in layers or beds
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name a sheild volcanoe
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Mauna loa(hawaii)
flat broad lava oozes gently not explosively much bigger |
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fumeroles
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gas vents in volcanoes
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decay rate Te .
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he rate at which a population of radioactive atoms decays into stable daughter atoms. Rate often expressed in
terms of half life of the parent isotope |
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name a strato volcanoe
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mt. st. helens
high silica layered explosive |
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stratigraphy
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The succession and age relation of layered rocks.
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define silica poor magma composition
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"thin" lava
easily flowing releases gasses easily due to it's thinness forms broad sheild volcanoes |
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isotope
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Atoms that differ in atomic mass number , but not in atomic number , are called isotopes. For example, Atoms that differ in atomic mass number , but not in atomic number , are called isotopes.
For ex. oxygen (atomic number 8) may have an atomic mass number of 16, 17, or 18, depending on whether it has 8, 9, or 10 neutrons. It therefore has three isotopes. |
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BONUS QUESTION
name a shield volcanoe on mars |
Mons olympus
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atomic number
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The number of protons in an atom, a quantity that determines which element the atom represents. Example: all
atoms of oxygen have 8 protons. |
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what are the hazards of escaping C02 gas from volcanoes
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it is invisible, and oderless therefore hard to detect untill it kills people
it seeps into soils- acidifying them, may kill live stodck it is heavier than air therefore seeks low spots, kills plant life and people There is currently a problem at mono lake |
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atomic mass number
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The sum of the number of protons and the number of neutrons in an atom. Approximately equal to the
mass of the atom. |
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magma versus lava
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magma= liquid rock below the ground
lava= liquid rock extruded above the ground |
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name 6 volcanic extrusions
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pillow basalt
pumice aa pahoehoe(Pah-hoy-hoy) absidian flows pyroclasts, tephra |
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name two types of magma composition
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silica rich
silica poor |
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what is pumice
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a type of volcanic extrusion sometimes called "frozen froth" because of the way it looks
it is a very vesicular basalt |
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what are are pyroclasts or tephra
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a type of volcanic extrusion made of pyroclastic debris, classified by size
ash-sm. lapilli-med. bombs-lg. (can be as big as a house) |
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what are pillow basalts
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a type of volcanic extrusion
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pahoehoe(pah-hoy hoy)
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a type of volcanic extrusion that is ropey and smooth
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what is aa
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a type of volcanic extrusion that is brittle and sharp, it flows,solidifies and breaks
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obsidian flows
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a type of volcanic extrusion- it is so thick it cant move and hardens, sometimes reffered to as volcanic glass.
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