Earth science chapter 10 questions

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10.1. A magma's viscosity is directly related to its ____.

silica content

10.2. Which of the following factors helps determine whether a volcanic eruption will be explosive or relatively quiet?

-amount of dissolved gasses in the magma
-temperature of the magma
-composition of the magma

10.3. A lava flow with a surface of rough, jagged blocks and sharp, angular projections is called a(n) ____.

aa flow

10.4. As the temperature of lava increases, ____.

its viscosity decreases

10.5. Which list places the magma types in order of decreasing viscosity (most viscous listed first)?

rhyolitic, andesitic, basaltic

10.6. Which of the following is NOT a factor affecting how explosively or quietly a volcano erupts?

size of the volcano's cone

10.7. Highly explosive volcanoes tend to have what type of magma?

magma with high silica, high viscosity, and higher gas content

10.8. A volcanic bomb is a ____.

piece of semi-molten rock ejected as glowing lava

10.9. The particles produced in volcanic eruptions are called ____.

pyroclastic material

10.10. Which of the following is NOT considered to be a pyroclastic material?

pahoehoe

10.11. Large particles of hardened lava ejected from a volcano are called ____.

blocks

10.12. Which of the following is true about volcanic blocks and bombs?

Bombs often have a streamlined shape.

10.13. What is the most abundant gas associated with volcanic activity?

water vapor

10.14. What type of volcano is built almost entirely from ejected lava fragments?

cinder cone

10.15. The broad, slightly dome-shaped volcanoes of Hawaii are ____.

shield volcanoes

10.16. A volcano that is fairly symmetrical and has both layers of lava and pyroclastic deposits is a ____.

composite cone volcano

10.17. What feature is labeled D in Figure 10-1?

crater

10.18. What feature is labeled A in Figure 10-1?

pipe

10.19. What type of volcano is illustrated in Figure 10-1?

composite cone

10.20. Which of the following plays a major part in determining the form of a volcano?

magma composition

10.21. Which of the following is true about cinder cones?

They have very steep sides.
They are usually less than 300 meters high.
They often occur in groups.

10.22. The most explosive volcanic eruptions are associated with what type of volcano?

composite cones

10.23. A caldera is a ____.

large depression in a volcano

10.24. Lava plateaus form when ____.

fluid basaltic lava flows out of fissures

10.25. The volcanic landform that is formed when the more resistant volcanic pipe remains after most of the cone has been eroded is called a ____.

volcanic neck

10.26. Crater Lake in Oregon was produced when ____.

the summit of a volcano collapsed

10.27. Structures that form from the cooling and hardening of magma beneath Earth's surface are ____.

plutons

10.28. How are intrusive igneous bodies classified?

by their size
by their shape
by their relationship to the surrounding rock layers

10.29. The largest intrusive igneous body is called a ____.

batholith

10.30. What is true about all plutons?

They form below Earth's surface.

10.31. Which type of intrusive feature forms when magma is injected into fractures cutting across preexisting rock layers?

dike

10.32. A lens-shaped intrusive igneous mass close to Earth's surface is called a ____.

laccolith

10.33. Which of the following is true about batholiths?

They are intrusive igneous bodies.
They are larger than stocks.
They are associated with major mountain ranges.

10.34. Which of the following factors affects the melting point of rock?

composition of the material
water content
pressure of the surrounding rock

10.35. Most shield volcanoes have grown from the ocean floor to form ____.

islands

10.36. If the feature labeled F in Figure 10-2 was exposed to erosion and reached over 100 square kilometers in area, it would be classified as a ____.

batholith

10.37. What volcanic feature is illustrated at A in Figure 10-2?

continental volcanic arc

10.38. What type of plate boundary resulted in the volcanic activity illustrated in Figure 10-2?

oceanic-continental convergent plate boundary

10.39. Which type of landform develops at plate boundaries where one oceanic plate descends beneath another?

volcanic island arc

10.40. At divergent plate boundaries in the ocean, magma rises and melts because of ____.

a decrease in pressure

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