The presence of mud cracks in a sedimentary rock is a sign that the rock was deposited:a.
in a region that was drying.
b. in a region that was under water.
c. in a desert.
d. beneath a glacier.
e. in a sand dune
Q. 2 -
A well-sorted sediment might consist of:
a. small grains of a variety of sizes (diameters).
b. large grains all of approximately the same size (diameter).
c. grains of moderate but different dimensions (diameters).
d. predominantly round grains.
e. predominantly smooth grains.
Q. 3 -
Graded bedding forms when:a.
erosion planes off a portion of the sea bottom.
b. sediment is deposited on a steep slope or grade.
c. turbidity currents deposit first coarse sediment then fine sediment.
d. cross-bedding is truncated.
e. turbidity currents deposit first fine sediment followed by coarse sediment
Q. 4 -
Ancient current directions can be determined by:
a. wave-formed ripple marks.
b. cross-bedding.
c. graded bedding.
d. mud cracks.
e. all of the above
Q. 5 -
The designation of sediment grain size, from largest to smallest, is:
a. clay, silt, sand, gravel.
b. gravel, sand, silt, clay.
c. gravel, silt, sand, clay.
d. clay, sand, gravel, silt.
e. silt, clay, gravel, sand
Q. 6 -
The properties used to describe detrital sediment are:a.
size.
b. sorting.
c. rounding.
d. size and rounding.
e. size, sorting and rounding
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