Chapter 3 Vocab

Question 1

A weak spot in the crust where magma has come to the surface.

Answer 1

Volcano

Question 2

The molten mixture of rock-forming substances,gases,and water from the mantle

Answer 2

Magma

Question 3

Liquid magma that reaches the surface; also the rock formed when liquid lava hardens

Answer 3

Lava

Question 4

A major belt of volcanoes that rims the Pacific Ocean

Answer 4

Ring of fire

Question 5

A string of islands formed by the volcanoes along a deep ocean trench.

Answer 5

Island arc

Question 6

An area where magma from deep within the mantle melts through the crust above it

Answer 6

Hot spot

Question 7

The pocket beneath a volcano where magma collects

Answer 7

Magma Chamber

Question 8

A long tube through which magma moves from the magma chamber to earths surface

Answer 8

Pipe

Question 9

The opening through which molten rock and gas leave a volcano

Answer 9

Vent

Question 10

The area covered by lava as it lies out of a volcano’s vent

Answer 10

Lava flow

Question 11

A bowl-shaped area that forms around a volcano’s central opening

Answer 11

Crater

Question 12

A material that is formed from the elements oxygen and silicon; Silica is found in magma.

Answer 12

Silica

Question 13

A hot, fast-moving type of lave that gardens to form smooth, ropelike coils.

Answer 13

Pahoehoe

Question 14

A slow-moving type of lace that hardens to form rough chunks; cooler than pahoehoe

Answer 14

AA

Question 15

The expulsion of ash, cinders, bombs, and gases during an explosive volcanic eruption.

Answer 15

Pyroclastic flow

Question 16

Said of a volcano that is erupting or has shown signs of erupting in the near future

Answer 16

Active

Question 17

Said of a volcano that does not show signs of erupting in the near future.

Answer 17

Dormant

Question 18

Said of a volcano that is unlikely to erupt again

Answer 18

Extinct

Question 19

A pool formed by groundwater that has risen to the surface after being heated by a nearby body of magma

Answer 19

Hot spring

Question 20

A fountain of water and steam that builds up pressure underground and erupts at regular intervals

Answer 20

Geyser

Question 21

Energy from water or steam that has been heated by magma

Answer 21

Geothermal Energy

Question 22

A wide, gently sloping mountain made of layers of lava and formed by quiet eruptions

Answer 22

Shield Volcano

Question 23

A steep, cone-shaped hill or mountain made of volcanic ash,Cinders,and bombs piled up around a volcano’s opening

Answer 23

Cinder Cone

Question 24

A tall, cone-shaped mountain in which layers of lava alternate with layers of ash and other volcanic materials

Answer 24

Composite Volcano

Question 25

The large hole at the top of a volcano’s magma chamber collapses

Answer 25

Caldera

Question 26

A deposit of hardened magma in a volcano’s pipe

Answer 26

Volcanic Neck

Question 27

A slab of volcanic rock formed when magma forces itself across rock layers

Answer 27

Dike

Question 28

A slab of volcanic rock formed when magma squeezed between layers of rock

Answer 28

Sill

Question 29

A mass of rock formed when a a large body of magma cooled inside the crust

Answer 29

Batholith