APSC 151 Midterm Questions
And Answers
Which of the following sedimentary rocks is usually biochemical in origin?
a) bedded salt
b) conglomerate
c)sandstone
d) wacke
e) limestone
✓✓✓✓~ e
What platy, parallel, mineral grains are the most visual aspect of foliated
metamorphic rocks?
a) carbonates
b) quartz
c) cocoliths
,d) micas
e) feldspars
✓✓✓✓~
Lava flows are typically finer grained than intrusive igneous rocks. Why?
a) The extrusive magma, because it is deep below the surface, cools very slowly
producing very small mineral grains.
b) Intrusive magma is cooler because it is well insulated by the surrounding
rock.
c) The extrusive magma cools quickly so the mineral grains do not have time to
grow.
d) Intrusive magma flows onto the surface and cools very slowly, allowing small
mineral grains to grow.
, e) the lava weathers before it can cool
✓✓✓✓~ c
Under the application of uniform, confining pressure, rocks will generally
________.
a) increase in density but retain primary bedding orientations
b) increase in porosity
c) grow or crystallize a new set of low density hydrous minerals
d) shatter and turn into a breccia
e) bend, fold, buckle, and shear to make typical deformed metamorphic textures
✓✓✓✓~ e
Which common rock forming minerals exhibit a perfect single basal cleavage?
And Answers
Which of the following sedimentary rocks is usually biochemical in origin?
a) bedded salt
b) conglomerate
c)sandstone
d) wacke
e) limestone
✓✓✓✓~ e
What platy, parallel, mineral grains are the most visual aspect of foliated
metamorphic rocks?
a) carbonates
b) quartz
c) cocoliths
,d) micas
e) feldspars
✓✓✓✓~
Lava flows are typically finer grained than intrusive igneous rocks. Why?
a) The extrusive magma, because it is deep below the surface, cools very slowly
producing very small mineral grains.
b) Intrusive magma is cooler because it is well insulated by the surrounding
rock.
c) The extrusive magma cools quickly so the mineral grains do not have time to
grow.
d) Intrusive magma flows onto the surface and cools very slowly, allowing small
mineral grains to grow.
, e) the lava weathers before it can cool
✓✓✓✓~ c
Under the application of uniform, confining pressure, rocks will generally
________.
a) increase in density but retain primary bedding orientations
b) increase in porosity
c) grow or crystallize a new set of low density hydrous minerals
d) shatter and turn into a breccia
e) bend, fold, buckle, and shear to make typical deformed metamorphic textures
✓✓✓✓~ e
Which common rock forming minerals exhibit a perfect single basal cleavage?
