PHYS 203 EXAM 2 NJIT EXAM WITH CORRECT ANSWERS
1. Molten rock below earth's surface is... Magma
2. Molten rock on earth's surface is... Lava
3. The violence of volcanic eruptions is mainly con- The viscosity of the magma
trolled by...
4. High viscosity of magma More violent eruptions
(Mount St. Helens)
5. Less viscosity of magma Less violent eruptions (Hawaii
over a hot spot)
6. Composition and temperature control... Viscosity
7. Lower temperature gives... Higher viscosity
Higher silica (SiO2) content gives...
8. Basaltic lava has low viscosity due to having... Less than 53% silica and
magma temperature of
1100-1250 Celsius
9. Rhyolitic lava has high viscosity due to having... More than 68% of silica
and magma temperature of
700-850 Celsius
10. Volcanic gases, such as CO2, escape more... Easily from low viscosity mag-
ma
11. Majority of active volcanoes are located at... Convergent plate boundaries
12. A shield volcano is... Gentle slopes that are formed
by longer distance of low vis-
cosity lava flow
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, PHYS 203 EXAM 2 NJIT EXAM WITH CORRECT ANSWERS
13. A strato volcano is... Cone shaped with steep
slopes that are formed by
shorter distance of high vis-
cosity lava flow
14. Volcanic debris carried by prevailing winds (tephra Areas hundreds of kilometers
and gasses) and flowing on the ground (lahar) af- away from volcanic eruptions.
fect...
15. A large crater that forms when a volcano collapses Caldera
into a shallow empty magma chamber below the
volcano is a...
16. The tallest mountain peaks are all in the... Himalayas
17. The continental crust is thickest under... Mountains formed along con-
vergent plate boundaries.
18. The tallest mountains in the United States are in... Alaska, the convergent plate
due to... boundary.
19. Controls how the topography of the Earth's surface Isostasy
is related to the thickness and density of the un-
derlying crust and mantle. Imagine a block of wood
floating on water with thickness below the water line
that decreases when wood density decreases.
20. Causes the crust to rise when material is eroded and Isostatic Compensation
to sink when material is added. Imagine a block of
wood floating on water, while adding or removing
weight from the top surface.
21. Erosion of mountains cause...
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1. Molten rock below earth's surface is... Magma
2. Molten rock on earth's surface is... Lava
3. The violence of volcanic eruptions is mainly con- The viscosity of the magma
trolled by...
4. High viscosity of magma More violent eruptions
(Mount St. Helens)
5. Less viscosity of magma Less violent eruptions (Hawaii
over a hot spot)
6. Composition and temperature control... Viscosity
7. Lower temperature gives... Higher viscosity
Higher silica (SiO2) content gives...
8. Basaltic lava has low viscosity due to having... Less than 53% silica and
magma temperature of
1100-1250 Celsius
9. Rhyolitic lava has high viscosity due to having... More than 68% of silica
and magma temperature of
700-850 Celsius
10. Volcanic gases, such as CO2, escape more... Easily from low viscosity mag-
ma
11. Majority of active volcanoes are located at... Convergent plate boundaries
12. A shield volcano is... Gentle slopes that are formed
by longer distance of low vis-
cosity lava flow
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, PHYS 203 EXAM 2 NJIT EXAM WITH CORRECT ANSWERS
13. A strato volcano is... Cone shaped with steep
slopes that are formed by
shorter distance of high vis-
cosity lava flow
14. Volcanic debris carried by prevailing winds (tephra Areas hundreds of kilometers
and gasses) and flowing on the ground (lahar) af- away from volcanic eruptions.
fect...
15. A large crater that forms when a volcano collapses Caldera
into a shallow empty magma chamber below the
volcano is a...
16. The tallest mountain peaks are all in the... Himalayas
17. The continental crust is thickest under... Mountains formed along con-
vergent plate boundaries.
18. The tallest mountains in the United States are in... Alaska, the convergent plate
due to... boundary.
19. Controls how the topography of the Earth's surface Isostasy
is related to the thickness and density of the un-
derlying crust and mantle. Imagine a block of wood
floating on water with thickness below the water line
that decreases when wood density decreases.
20. Causes the crust to rise when material is eroded and Isostatic Compensation
to sink when material is added. Imagine a block of
wood floating on water, while adding or removing
weight from the top surface.
21. Erosion of mountains cause...
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