Volcanoes

Question 1

Why do eruptions happen?

Answer 1

Stem from the release of magma on to earth’s surface

Question 2

How many active volcanoes are their?

Answer 2

1,500 at least

Question 3

How many volcanic eruptions are their each year?

Answer 3

50 every year

Question 4

What are the types of rocks that are erupted from volcanoes?

Answer 4

Basalt
Andesite
Dacite
Rhyolite

Question 5

What is one of the most common content on Earth?

Answer 5

Silica

Question 6

What is the rate of how much silica and viscosity is in dacite and Rhyolite?

Answer 6

Very High and because of this, gasses have a slim chance of getting out of this rocks.

Question 7

What are the types of volcanoes?

Answer 7

Cinder Cones
Shield Volcanoes
Composite Volcanoes

Question 8

What is another name for composite volcanoes?

Answer 8

Strato Volcanoes

Question 9

What is the non-explosive shield-like mountain called?

Answer 9

Lava Dome

Question 10

What is the most dangerous, violent, and explosive volcanoes called?

Answer 10

SuperVolcanoes

Question 11

What are examples of a caldera?

Answer 11

Yellowstone National Park

Question 12

How explosive is a cinder cone and a shield volcano?

Answer 12

Mildly explosive

Question 13

Why is a cinder cone and a shield volcano mildy explosive?

Answer 13

Because of the basalt that is inside of the volcano

Question 14

How explosive is a composite (strato) volcano?

Answer 14

Mild to Highly explosive

Question 15

Why is the composite volcano mild to highly explosive?

Answer 15

Because of the dacite having a lot of silica and because it’s hard for the gasses to escape and when they do there is a massive explosion.

Question 16

Why is a supervolcano extremely dangerous and explosive?

Answer 16

Because of the Rhyolite having high levels of silica and because of the trapped gases staying inside of the Rhyolite so long and when the gasses come out there is an even bigger explosion than Dacite

Question 17

How do cinder cone volcanoes form?

Answer 17

Constructed from fountains of lava that rain around the vent.

Question 18

What is the biggest eruption recorded in U.S. history?

Answer 18

Mt. St. Helens

Question 19

What is a shield volcano?

Answer 19

Basically really big, long duration cinder cones that form layers because of there constant eruptions

Question 20

What is an example of a shield volcano?

Answer 20

Mauna Loa, Olympus Mons,

Question 21

What is a composite volcano?

Answer 21

are formed by alternating layers of ash fallouts and lava flows

Question 22

What is a classic composite volcano example?

Answer 22

Mt. Fuji

Question 23

What is a lava dome?

Answer 23

Highly viscous eruptions that build internally and externally

Question 24

Where is a lava dome forming right now?

Answer 24

Mt. Saint Helens

Question 25

What is a caldera?

Answer 25

Highly explosive eruptions that lead to structural collapse from an emptied magma chamber

Question 26

How wide is crater lake?

Answer 26

6 miles wide

Question 27

How large is long valley caldera?

Answer 27

15 miles wide

Question 28

What is a lahar?

Answer 28

a hot or cold mixture of water and rock fragments flowing (70 mph) down the slopes of a volcano and into river valleys

Question 29

What is pyroclastic flows?

Answer 29

fluidized masses of rock fragments and gases that move rapidly in response to gravity (can travel over 400 miles per hour, and reach temperatures approaching 2,000° F)

Question 30

Which has more mositure pyroclastic flows or lahars?

Answer 30

Lahars

Question 31

Which has superheated steam?

Answer 31

Pyroclastic Flows

Question 32

True or False: Lahars and Pyroclastic flows are both fluidized

Answer 32

True

Question 33

What is CO2 emissions?

Answer 33

Release of CO2 from buried magma into the atmosphere through faults, fissures, and lakes.

Question 34

What are some positives associated with volcanic eruptions?

Answer 34

Fertile Soil Geothermal Energy New Land

Question 35

What kind of volcano is Mt Saint Helens?

Answer 35

Composite (Strato) Volcano

Question 36

The Hawaiian Islands are mainly this type of volcano...

Answer 36

Shield Volcanoes

Question 37

A volcano with a low viscosity most likely has what kind of magma inside of it?

Answer 37

Basalt forming magma

Question 38

Which ingredient makes lava more viscous?

Answer 38

Silica

Question 39

Igneous intrusions can produce...

Answer 39

Granite

Question 40

The main dissolved gasses in lava are what?

Answer 40

Water and Carbon Dioxide

Question 41

What are Hawaii and Iceland known as?

Answer 41

Hot spots

Question 42

Why do some volcanoes have steep slopes?

Answer 42

thick lava solidifies before it gets far down slope

Question 43

Which type of volcano is Kilauea in Hawaii?

Answer 43

shield

Question 44

Which type of volcano has a cone shape, but is usually much smaller than a composite volcano which can also have a cone shape?

Answer 44

cinder cone

Question 45

What is it called when a crack in the crust forms as plates pull away from each other?

Answer 45

Fissure

Question 46

The name of our solar system's largest mountain which scientists believe may also be a shield volcano:

Answer 46

Olympus Mons

Question 47

One of the easiest ways that some scientists and non-professionals are able to classify volcanoes as dangerous vs approachable is based on their:

Answer 47

Color