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1

What is the silica content of andesitic lava? (Major extrusive tectonics)

Medium

2

What is the silica content of rhyolitic lava? (Major extrusive tectonics)

High

3

What is the viscosity of basaltic lava? (Major extrusive tectonics)

Low (runny)

4

What is the viscosity of andesitic lava? (Major extrusive tectonics)

Medium

5

What is the viscosity of rhyolitic lava? (Major extrusive tectonics)

High (thick)

6

What is the temperature of basaltic lava? (Major extrusive tectonics)

1,110-1,200 degrees

7

What is the temperature of andesitic lava? (Major extrusive tectonics)

750-950 degrees

8

What is the temperature of rhyolitic lava? (Major extrusive tectonics)

Less that 750 degrees

9

What sort of lava produces the most violent eruption? (Major extrusive tectonics)

Rhyolitic (high viscosity)

10

What characteristics are shown by AA lava? (Major extrusive tectonics)

•heat loss = high viscosity
•forms a crust
•fast moving

11

What characteristics are shown by Pahoehoe lava? (Major extrusive tectonics)

•slow moving
•well developed skin forms

12

What two types of eruptions can occur? (Major extrusive tectonics)

•Fissure eruptions
•Vent eruptions

13

What is the silica content of basaltic lava? (Major extrusive tectonics)

Low

14

Name the 6 types of volcanoes (major extrusive tectonics)

•ash/cinder
•basic shield
•caldera
•composite cone
•fissure
•acid dome

15

What does an ash/cinder cone volcano look like? (Major extrusive tectonics)

•no lava
•small
•made of loose grainy cinders
•steep sides
•small crater

16

What is an example of an ash/cinder cone volcano? (Major extrusive tectonics)

Particutin, Mexico

17

What does a basic shield volcano look like? (Major extrusive tectonics)

•basaltic lava
•very large
•low slopes
•large crater

18

What is an example of a basic shield volcano? (Major extrusive tectonics)

Islands of Hawaii

19

What does a caldera volcano look like? (Major extrusive tectonics)

•rhyolitic lava
•circular depressions found on the summit
•form by collapsed of the volcano itself
•edges appear as a steep cliff

20

What is an example of a caldera volcano? (Major extrusive tectonics)

Vaues, New Mexico

21

What does a composite cone look like? (Major extrusive tectonics)

•andesitic lava
•very large
•steep sides
•small crater

22

What is an example of a composite cone volcano? (Major extrusive tectonics)

Mount St Helens, USA

23

What does a fissure volcano look like? (Major extrusive tectonics)

•basaltic lava
•no central crater
•crack in the ground
•vast quantities of lava

24

What is an example of a fissure volcano? (Major extrusive tectonics)

Los Pilas, Nicaragua

25

What does an acid done volcano look like? (Major extrusive tectonics)

•rhyolitic lava
•dome grows from within
•dome cools, hardens, then shatters

26

What is an example of an acid dome volcano? (Major extrusive tectonics)

Novarupta, Alaska

27

Why do explosive eruptions occur? (Major extrusive tectonics)

Cooler magma reaches the surface and dissolved gasses can't escape, so pressure builds

28

What are the 7 types of explosions from a volcano? (Major extrusive tectonics)

•Icelandic
•Hawaiian
•Strombolian
•Vulcanian
•vesuvian
•Peléean
•Plinian

29

What type of lava flows from a Icelandic eruption? (Major extrusive tectonics)

Basaltic

30

What type of lava flows from a Hawaiian eruption? (Major extrusive tectonics)

Basaltic