Download Characteristics of Four Magma Samples

Directions (1–11) For each statement or question,
select the word or expression that, of those given, best
completes the statement or answers the question.
Record your answers on a separate answer sheet.
1. At the Mid-Atlantic Ridge and the East Pacific
Rise, lithospheric plates are generally
6. Which of the following would NOT be found at
or near a subduction boundary?
(a) deep-sea trench
(b) mountains and volcanoes
(c) subducting oceanic crust
(d) subducting continental crust
(a) colliding
(b) moving over a hot spot
7. A graben is bounded on each side by
(c) moving apart
(a) strike-slip faults
(c) reverse faults
(d) subducting
(b) thrust faults
(d) normal fault
2. The Hawaiian Islands formed
(a) at a subduction boundary between two
oceanic plates
(b) at a mid-ocean ridge
8. Which of the following cannot transmit S waves?
(a) outer core
(c) mantle
(b) asthenosphere
(d) lithosphere
9. Fault-block mountains are associated with
(c) over a hot spot
(a) normal faults
(c) thrust faults
(d) at a subduction boundary between an
oceanic plate and a continental plate
(b) reverse faults
(d) strike-slip faults
3. If a lava flow covers an impact crater on the
moon, scientists may conclude that
(a) the lava flow caused the crater to form
Base your answers to questions 10 and 11 on the table
below.
Characteristics of Four Magma Samples
(b) the lava flow is older than the crater
Magma
A
Magma
B
Magma
C
Magma
D
Silica
content
60%
52%
69%
62%
Gas
content
4%
1%
4.5%
3.5%
Melting
point
Medium
High
Low
Medium
(c) the lava flow is the same age as the crater
(d) the lava flow is younger than the crater
4. Liquefaction is most likely to affect buildings when
(a) the buildings are located on granite bedrock
(b) the buildings are located near a lake
(c) the buildings are located on loose sediments
(d) the buildings are located on limestone bedrock
5. Scientists infer that Earth’s outer core is liquid
based primarily on their studies of
(a) earthquake waves
(b) magnetic polarity reversals
(c) lithospheric heat flow
(d) magma
252
Unit 3 Dynamic Earth
10. The magma most likely to produce an explosive
eruption is
(a) magma A
(c) magma C
(b) magma B
(d) magma D
11. The magma most likely to produce a
nonexplosive eruption is
(a) magma A
(c) magma C
(b) magma B
(d) magma D