Lab 2 Isostasy Post-Lab Quiz

A  The 1-to-8 Rule states that if the you add 1 unit of crust onto the top of a crustal package, then you must add 7 units of crust to the bottom of the crust to create isostatic equlibrium to the newly thickened crustal package for a total of 8 units of added thickness to the crust.

B  The 1-to-8 Rule states that if the you add 1 unit of crust onto the top of a crustal package, then you must add 8 units of crust to the bottom of the crust to create isostatic equlibrium to the newly thickened crustal package for a total of 9 units of added thickness to the crust.

C  The 1-to-8 Rule states that if the you add 7 units of crust onto the top of a crustal package, then you must add 1 unit of crust to the bottom of the crust to create isostatic equlibrium to the newly thickened crustal package for a total of 8 units of added thickness to the crust.

D  The 1-to-8 Rule states that if the you add 1 unit of crust onto the top of a crustal package, then you must subtract 8 units of crust from the bottom of the crust to create isostatic equlibrium to the newly thickened crustal package for a total of 7 units of subtracted crustal thickness.

A  The base of the crust (crustal root) essentially does nothing while the mountain grows taller.

B  The base of the crust (crustal root) becomes thinner and sits more shallow in the mantle to compensate for the increased mountain mass over it.

C  The base of the crust (crustal root) becomes thicker and sits deeper into the mantle to compensate for the increased mountain mass over it.

D  The base of the crust (crustal root) essentially does nothing while the mountain grows taller.

A  The Big Island was built in an ancient asteroid crater than formed on the deep sea bottom

B  The ocean crust has cooled down under the Big Island to cause crust to isostatically sink.

C  The volcano’s excess mass caused the underlying ocean crust to bend downwards to isostatically compensated

D  The Big Island was built in an ancient asteroid crater than formed on the deep sea bottom

A  Start to subside

B  Start to uplift

C  Just sits there.

D  Just sits there.

A  Nothing happened – no vertical crustal adjustments have occurred since the ice caps started to thin and disappear.

B  Ice age, what ice age?

C  The North American continent isostatically adjusted to the thinning/removal of the continental ice sheets by buoying up out of the mantle

D  The North American continent isostatically adjusted to the thinning/removal of the continental ice sheets by sinking lower into the mantle

A  Nothing happened

B  The North American continent isostatically adjusted to the added ice thickness by sinking lower into the mantle

C  Ice age, what ice age?

D  The North American continent isostatically adjusted to the added ice thickness by buoying up out of the mantle

A  Need to erode 7 kilometers of crust to achieve new isostatic equilibrium

B  Need to erode 21 kilometers of crust to achieve new isostatic equilibrium

C  Need to erode 28 kilometers of crust to achieve new isostatic equilibrium

D  Need to erode 16 kilometers of crust to achieve new isostatic equilibrium

A  55km

B  70km

C  85km

D  45km

E  35km

A  Both icebergs will have the same percentage of it’s thickness underwater.

B  The two icebergs will have the different proportions of it’s thickness underwater. – the shorter one will have a greater percentage underwater than the taller one.

C  There is no way to tell – no two icebergs are alike.

D  The two icebergs will have the different proportions of it’s thickness underwater. – the taller one will have a greater percentage underwater than the short one.

A  35%

B  15%

C  85%

D  65%

E  50%

A  0.55 g/cm3

B  0.65 g/cm3

C  0.75 g/cm3

D  0.45 g/cm3

E  0.85 g/cm3

F  0.35 g/cm3

A  Temperature

B  Density

C  Thickness

D  Time of year

E  Time of day

A  Granite

B  Basalt

C  Marble

D  Shale

E  Sandstone

A  Marble

B  Shale

C  Granite

D  Peridotite

E  Basalt

A  They have the same thickness

B  Oceanic

C  Continental

A  They have the same density

B  Oceanic

C  Continental

A  1.14 g/cm3

B  1.30 g/cm3

C  0.71 g/cm3

D  0.41 g/cm3

E  0.53 g/cm3

F  0.89 g/cm3

A  285.8 cm3

B  315.8 cm3

C  232.6.8 cm3

D  222.6 cm3

E  205.8 cm3

F  295.8 cm3

A  0.54 g/cm3

B  1.18 g/cm3

C  0.73 g/cm3

D  0.66 g/cm3

E  0.98 g/cm3

F  0.85 g/cm3

A  60.9 cm3

B  90.4 cm3

C  162.4 cm3

D  136.3 cm3

E  111.1 cm3

F  142.4 cm3

A  2.7 g/cm3

B  2.3 g/cm3

C  3.1 g/cm3

D  2.5 g/cm3

E  2.9 g/cm3

F  3.3 g/cm3

A  4.4 g/cm3

B  5.2 g/cm3

C  5.4 g/cm3

D  5.0 g/cm3

E  4.8 g/cm3

F  4.6 g/cm3

A  2.8 g/cm3

B  2.9 g/cm3

C  1.3 g/cm3

D  2.7 g/cm3

E  2.6 g/cm3

A  4.9 g/cm3

B  5.1 g/cm3

C  5.7 g/cm3

D  4.4 g/cm3

E  5.9 g/cm3

F  5.4 g/cm3

A  3.0 g/cm3

B  1.0 g/cm3

C  0.5 g/cm3

D  1.5 g/cm3

E  2.5 g/cm3

F  2.0 g/cm3

A  22 g/cm3

B  4.1 g/cm3

C  4.7 g/cm3

D  2.7 g/cm3

E  1.8 g/cm3

F  3.6 g/cm3

A  0.6 g/cm3

B  0.4 g/cm3

C  0.2 g/cm3

D  1.3 g/cm3

E  0.9 g/cm3

F  1.6 g/cm3

A  4.5 g/cm3

B  2.1 g/cm3

C  3.4 g/cm3

D  3.9 g/cm3

E  2.4 g/cm3

F  2.9 g/cm3

A  2,640 cm3

B  1,070 cm3

C  880 cm3

D  1,940 cm3

E  1,320 cm3

F  1,680 cm3

A  Ruler method: measure the three dimensions

B  There really is no way to get the exact volume for something like a rock

C  Reconstitution method by grinding up and placing in a graduated container

D  Weigh the object on a scale

E  Eyeball method by comapring it several objects of known volume

F  Displacement method by submerging in water-filled graduated container