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24 Cards in this Set

  • Front
  • Back
The amount of time that it takes for one half of an original population of atoms of a radioactive isotope to decay.
define silica rich magma composition
traps escaping gas
forms steep stratavolcanoes(the kind that was seen in joe versus the volcanoe)
what one important factor distinguishes a strato volcanoe from a shield volcanoe
strato= high silica content
sheild = low silica content

The accumulation of material in layers or beds
name a sheild volcanoe
Mauna loa(hawaii)
flat broad
lava oozes gently
not explosively
much bigger
gas vents in volcanoes
decay rate Te .
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
name a strato volcanoe
mt. st. helens
high silica
The succession and age relation of layered rocks.
define silica poor magma composition
"thin" lava
easily flowing
releases gasses easily due to it's thinness
forms broad sheild volcanoes
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.

name a shield volcanoe on mars
Mons olympus
atomic number
The number of protons in an atom, a quantity that determines which element the atom represents. Example: all
atoms of oxygen have 8 protons.
what are the hazards of escaping C02 gas from volcanoes
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
atomic mass number
The sum of the number of protons and the number of neutrons in an atom. Approximately equal to the
mass of the atom.
magma versus lava
magma= liquid rock below the ground
lava= liquid rock extruded above the ground
name 6 volcanic extrusions
pillow basalt
absidian flows
pyroclasts, tephra
name two types of magma composition
silica rich
silica poor
what is pumice
a type of volcanic extrusion sometimes called "frozen froth" because of the way it looks
it is a very vesicular basalt
what are are pyroclasts or tephra
a type of volcanic extrusion made of pyroclastic debris, classified by size
bombs-lg. (can be as big as a house)
what are pillow basalts
a type of volcanic extrusion
pahoehoe(pah-hoy hoy)
a type of volcanic extrusion that is ropey and smooth
what is aa
a type of volcanic extrusion that is brittle and sharp, it flows,solidifies and breaks
obsidian flows
a type of volcanic extrusion- it is so thick it cant move and hardens, sometimes reffered to as volcanic glass.