pratice test
rhyolitic/felsic magma/lava contains about _ silica by weight
70%
a high viscosity magma would likely have all the following characteristics except
a high temperature
symmetrical ripple marks
are formed by oscilating currents
at which types of plate boundaries does igenous activity occur
both a and c
the decomposition of minerals and rocks into new minerals, mineral-like substances, and/or ions is called
chemical weathering
a bio-chemical sedimentary rock, that forms from siliceous oozes in a deep sea environment, is called
chert
which rock is not a clastic/detrital sedimentary rock
coal
list 2 sub-processes of lithification
compaction, convection
which depositional envitonment, listed below, is not an example of a marine depositional environment
contiental shelf
a tabular, discordant pluton is called
dike
which is not one of the 4 types of metamorhpism
directional
which is not a type of clay mineral
dunite
these two chemical rocks, rock salt and rock gypsum, are also referred to as
evaporites
the parallel alignment of flat, platy minerals is called
foliation
a fine-grained, very dark coloured igenous rock is called an
granite
what is the state rock for NC
granite
a igneous rock, which has exceptionally large crystals and froms from very slow cooling within the earths crust, composed primarly of potassium feldspar, quartz, and mica is called
granite pregmatite
a fine-grained granular metamorphic rock formed by contact metamorphism of a shale or mudstone is called a
hornfels
a metamorphic mineral that forms over a very narrow or specific P-T range is called a
index mineral
A ___ igneous rocks is one that cools and crystallizes slowly within the earths crust
intrusive
what is the most important chemical constituent in magma
iron oxide
which statement is not true about blueschist metamorphism
it is equivalent to contact metamorphism
what semi-precuious stone is Dr.Harpers lucky lifesaver made of
jade
what north carolina pegmatite mine produces a rare mica that contains lithium
kinds moutain pegmatite, NC
a type of sandstone, which contains abundant sand-sized rock fragments is called a/an _ sandstone
lithic sandstone
phyllite is produced from
low grade (greenschist grade) regional metamorphism of a shale
a mafic/basaltic magma that undergoes normal or ideal crystallization would crstalize to form a/an
mafic rock
molton rock that cools and crystallizes within the earths crust is called
magma
name a metamorphic rock that is used for interior building facings in expensive hotels and tombstones
marble
textural, mineralogical, and/or chemical changes that take place in the solid state in response to changes in pressure and temperature and introduction of chemically active fluids is called
metamorphism
for chemical and bio-chemical sedimentary rocks, the primary classification criterion is
mineral composition
a period of moutain building, igenous activity, regional metamorphism, and deformation is called
orogeny
a body of intrusive igneous rock that cools within the earths crust is called an
pluton
an igneous rock with 2 distinct crystal sizes has a _ texture
porphyritic
an igneous rock with a black-coloured, fine grained groundmass, which contains olivine phenocrysts would be a
porphyritic basalt
the 2 most abundant minerals in clastic/detrial sedimentary rocks are
quartz and feldspar
