GMU Geol 101|50 Exam 1 Questions With Answers|55 Pages |2025
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Course
GMU Geol 101
Institution
GMU Geol 101
How do magmas evolve? - ️️crystal settling:
earlier-formed minerals are denser than the liquid portion of the magma and sink to the base of the magma chamber
magmatic differentiation:
the formation of one or more secondary magmas from a single parent magma
assimilation:
as magma migrat...
GMU Geol 101 Exam 1
How do magmas evolve? - ✔️✔️crystal settling:
earlier-formed minerals are denser than the liquid portion
of the magma and sink to the base of the magma
chamber
magmatic differentiation:
the formation of one or more secondary magmas from a
single parent magma
assimilation:
as magma migrates through the crust, it may incorporate
some of the surrounding rock
magma mixing:
,during the ascent of 2 chemically different magma
bodies, the more buoyant mass may overtake the slower-
rising body
How does slope/topography influence soil formation? -
✔️✔️steep slopes
have poorly developed soils; moisture content of these
areas is often insufficient for plant growth
How does the rate of cooling impact igneous crystal size?
- ✔️✔️rapid rate of cooling(aphanitic texture):
many microscopic crystals
slow cooling(phaneritic texture)
few large, visible crystals
How is plate motion measured? - ✔️✔️global
positioning system:
measuring plate motion from space is accomplished by
using this to measure various points on Earth's surface
,How much of the Earth's crust is covered by sedimentary
rocks? - ✔️✔️5 percent crust
75 percent earth
sedimentary rocks
products of mechanical and chemical weathering
How old is the Earth? - ✔️✔️4.6 Billion
If I found a rock like coquina, what environment would
you believe it formed in? - ✔️✔️Marine
Besides the silicates, name one other class of minerals. -
✔️✔️Non silicates:[
carbonates.
halides.
sulfates.
oxides
, .sulfides.
phosphates.
native elements.
Continental/continental collisions produce what? - ✔️✔
️very tall mountain ranges, such as the Himalayas
Curie point - ✔️✔️when the basalt cools below this, the
magnetite aligns toward the position of the north pole
Describe the igneous rock textures. - ✔️✔️texture
the overall appearance of a rock based on the size, shape,
and arrangement of mineral grains
aphanitic texture
rapid rate of cooling, microscopic crystals
phaneritic texture
slow cooling, large, visible crystals
porphyritic texture
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