Still EAS Flashcards
Cement bonding
binding particles have a crystalline structure
Matrix bonding
sedimentary grains binding together larger fragments
List the six concentric layers of the sun
Core: site of all fusion reations
Radiative layer: energy from the core moves across by radiation
Convective layer: energy moves as convection
Photosphere: visible portion of the sun that emits light
Chromosphere: low-density layer of very hot gas
Corona: layer of even lower density gas
Briefly summarize the thermonuclear reaction that occurs inside the sun
4H are fused into 1He and energy, releasing gamma rays that eventually (in part) reach earth’s surface
Radiometric age-dating formula
log(current/original)
t(age)= ________________
log(1/2)
Felsic magma and rocks
silica rich (>70%)
typically formed by melting of crust
viscous magma
solidify at relatively low temp (600-900) ((bc of silica content))
rocks are abundant in quartz and K-feldspar
pale colour
Mafic magma and rocks
45-50% silica
typically formed by partial melting of mantle
low viscosity magma
solidifies >1000
rocks are abundant in ferromagnesian minerals, Ca-Feldspar
dark colour
Intermediate magma
50-70% silica
typically form at depth in subduction zones
intermediate properties
moderate viscosity
solidify at room temperature
rocks are mainly ferromagnesian minerals, Na-Ca Feldspar
grey colour
Ultramafic rocks
<45% silica
ex. the mantle
no ultramafic eruptions at present day (never occurs in magma form)
little to no quartz or feldspar
Intrusions
magma that solidifies below ground
Dikes
tabular, parallel-sided intrusions that cut across the layering of the rock
Sills
tabular, parallel-sided intrusions that lie parallel to the layers of rock
Laccoliths
tabular sills that cause rock layers to bend upward
Stocks
irregular intrusive bodies less than 10km in maximum dimension
Batholiths
massive stocks (up to 1000km long and 250km wide)
