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UT OnRamps Geoscience Unit 3 || Questions and 100% Verified Answers.

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Clastic Sedimentary correct answers Formed of broken pieces of other rock, involves erosion, transport, deposition and lithification, fragmented Chemical Sedimentary correct answers Formed either by precipitation or a biologic process, involves precipitation, deposition and lithification, crysta...

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  • September 26, 2024
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  • UT OnRamps Geoscience Unit 3
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UT OnRamps Geoscience Unit 3 || Questions and 100%
Verified Answers.
Clastic Sedimentary correct answers Formed of broken pieces of other rock, involves erosion,
transport, deposition and lithification, fragmented

Chemical Sedimentary correct answers Formed either by precipitation or a biologic process,
involves precipitation, deposition and lithification, crystals or visible shells and plant remains

Sedimentary Rock Location correct answers Black - stagnant, green - shallow/circulating,
brown/red - terrestrial

Clastic Grain Size correct answers Finer grain = greater distance of transport

Crossbedding correct answers Tilted rock layers due to angled bed

Sedimentary Layering correct answers Horizontal layers of deposited sediment

Ripple Marks correct answers Small waves of sediment formed by running water or blowing
wind

Graded Bedding correct answers Bedding in which the particle sizes become progressively
heavier and coarser toward the bottom layers

Mudcracks correct answers Sedimentary structures that form, often in hexagonal patterns, as
fine-graded, clay rich sediments dry out and shrink

Flute Casts correct answers U-shaped marks made in river beds when logs are dragged along

Stromatolites correct answers Oldest known fossils formed from many layers of bacteria and
sediment, prokaryotes

Cyanobacteria correct answers Photosynthetic, oxygen-producing bacteria, source of early
oxygen spikes

Concretions correct answers Hard, round structures that form when minerals settle out of water
and crystallize around a sand grain or other mineral fragment

Principle of Original Horizontality correct answers Layers of sediment are generally deposited in
a horizontal position

Principle of Superposition correct answers States that in undisturbed rock layers, the oldest rocks
are on the bottom and the rocks become progressively younger toward the top

, Principle of Lateral Continuity correct answers Layers are continuous until encountering an
obstruction

Uncoformity correct answers A break in the geologic record created when rock layers are eroded
or when sediment is not deposited for a long period of time

Angular Unconformity correct answers Tilted rocks are overlain by flat-lying rocks

Disconformity correct answers A type of unconformity in which the sedimentary layers above
and below the unconformity are parallel

Nonconformity correct answers An unconformity in which older metamorphic or intrusive
igneous rocks are overlain by younger sedimentary strata

Principle of Cross-cutting Relationships correct answers A rock or fault is younger than any rock
or fault through which it cuts

Principle of Inclusion correct answers Fragments of rock that are contained (or included) within
a host rock are older than the host rock

Strike and Dip correct answers Strike is the angular distance of a horizontal line in a plane, dip is
the inclination of the plane. Dip is measured at 90° to strike. Together, strike and dip uniquely
define the orientation of a planar surface such as a bedding layer or fault surface, strike = longer
line, dip = bisects strike line, number = incline angle

Deformation Forces correct answers Compression - squeezing, tension - stretching, shear -
sliding

Responses to Deformation correct answers Ductile vs brittle

Brittle Deformation correct answers Faulting - normal extension (stretching, away from each
other), thrust or reverse compression (shortening, toward each other), strike slip shearing (no
change in length, past each other)

Ductile Deformation correct answers Folding, stretching and thinning or shearing

Anticline correct answers Sad face fold, followed by syncline

Syncline correct answers Happy face fold, followed by anticline

Dome correct answers Oldest rock in middle, youngest out, rings

Basin correct answers Youngest rock in middle, oldest out, rings

Cenozoic Era correct answers 66 million years ago - present day, known as the "Age of
Mammals"

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