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rocks
physical geography chap 8
Term | Definition |
---|---|
How is igneous rock formed? | cooling of magma |
How is sedimentary rock formed? | accumulation of sediment compacting |
How is metamorphic rock formed? | rock altered by physical or chemical means. by heat, pressure, or other processes. takes place below earth's surface |
mineral | natural occuring inorganic crystal/solid definite chemical composition |
rock | combination of minerals |
Types of igneous rocks | intrusive and extrusive |
intrusive igneous characteristics | cools/crystalizes slowly beneath surface course grained (can identify individual minerals) more likely to have crystals |
extrusive igneous characteristics | volcanic, cools/crystallizes quickly fine grained (can't identify ind minerals) |
Intrusive igneous rock types | -granite -diorite -gabbro |
extrusive igneous rock types | -rhyolite -andesite -basalt |
dike | vertical crack filled with intrusive igneous rock |
sill | horizontal crack filled with intrusive igneous rock |
differential erosion | different rocks erode at different rates |
glaciation | causes erosion, the result of being covered by ice sheets |
denudation | erosion by water ice wind |
pluton | a body of intrusive igneous rock the largest pluton is called a batholith |
the three types of sedimentary rocks | clastic, chemical, organic |
clastic sedimentary- cliff former vs slope former | cliff- formed by more resistance slope- formed by less |
clastic sedimentary- cross bedding | change in direction of rock bedding |
clastic sedimentary- bedding planes | planes of weakness where rock breaks |
chemical sedimentary- | sediments are chemical precipitation of dissolved materials |
organic sedimentary- | organic material like plant and animal remains compacted together |
The rock cycle | any rock given enough time turns into other rocks because earth materials cycle over time |
caldera | when stratovolcano erupts so violently it collapses int magma chamber |
ring of fire | surrounds pacific plate |
down fold | trough like syncline |
upfuld | arch like anticline |
Gondwana | super continent in southern hemisphere |
laurasia | super continent in northern hemisphere |
graben | block dropped down between 2 normal faults |
horst | upthrown block |
overthrust | fault caused by compression, hanging wall pushed up by shallow angle |
lahar | volcaninc mudflow |
2 most common elements in earths crust | silicon and oxygen |
plutonic rock is | intrusive, cools slowly, can identify individual minerals |
volcanic igneous rock is, | fine grained, cools quickly, extrusive igneous |
basalt | denser then granite |
san juan mtns are made of lava flow and ash | |
denudation | lowering of landscape |
yellowstone erupts every 600,000 years | |
felsic | volcano erupts |
mafic | ooze lava |
diorite | composed of mafic and felsic intrusive igneous rock |
crossbedding in sandstone | evidence of warm shallow seas |
clastic | sedimentary rock composed from broken up pieces of other rocls |
andesite | igneous contains quartz feldspar intermediate in mineral comp |
mantle | plastic lower and brittle upper |
ancient mountain roots | inactive continental relief feature in Applachian mtns and urals |
midoceanic ridge | submarine hills |
axial rift | narrow trench like features |
subduction zone | location for earthquake to trigger tsunami |
subduction | when oceanic and cont plates collide |
spreading boundary | causes normal faulting horsts and grabwnsandstone canyon is |
erosional landform | sandsstone canyon |
exposed shield | inactive flat stable region in middle of cont plate |
stratovlolcao | composed of layersof felsic lava and tephra |