Volcanoes

Question 1

how are volcanoes formed?

Answer 1

when molten rock (magma) from the mantle bursts through a weakness n the earths curst

Question 2

what is the red hot molten rock that is being realesed?

Answer 2

lava

Question 3

what are the people called who study volcanoes?

Answer 3

vulcanologist

Question 4

where does pressure build up in a volcanoe?

Answer 4

in the magma chamber

Question 5

what comes out of the vents of a volcanoes ?

Answer 5

ash and steam

Question 6

what happens when a volcanoes erupts?

Answer 6

lava flows from the vents and red hot fragments of rock, dust and ash, steam and other gases shoot out of the crator

Question 7

what are the larger fragments of rock that are blown out of the crater called?

Answer 7

volcanic bombs or lava bombs

Question 8

what are the features of lava?

Answer 8

runny or pasty like toothpaste

Question 9

what happens if the lava is runny?

Answer 9

flood larges area and when cooled form large basalt plains

Question 10

what can thick, pasty lava cause?

Answer 10

lava block the vents when it cools which build up magma

Question 11

what happenes when the volcanoes pressure increases?

Answer 11

it starts to buldge and the top “blows up” which thrusts the rocks and send lava and gases high in the air

Question 12

what are the types of volcanoes ?

Answer 12

lava dome, shield volcanoe, compostie volcanoe and cinder cone

Question 13

what is the other name for composite volcanoe?

Answer 13

starto

Question 14

what is the other name for cinder volcanoe?

Answer 14

scoria cone

Question 15

what is pyroclastic flow?

Answer 15

fast moving current of hot gas, ask and rock/ lava bombs

Question 16

how does pyroclastic flow travel?

Answer 16

hugs the ground, and downhill and sometimes spreads laterally

Question 17

what does pyroclastic flow depend of?

Answer 17

the denisty of the current, the volcanic output rate or the gradient of the slope.

Question 18

what can pyroclastic flow generate?

Answer 18

a lahar

Question 19

how does pyroclastic flow generate a lahar?

Answer 19

from rain or melted water from glarciers or ash mixes

Question 20

what is a lahar?

Answer 20

violent mud flow or debris that is composed of a slurry pyroclastic material, rocky debris and water

Question 21

where does lahar tyipcally flow?

Answer 21

along river vallies

Question 22

what are the two types of volcanoes?

Answer 22

active and extinct

Question 23

what are the two types of active volcanoes?

Answer 23

domant and erupting

Question 24

what are active volcanoes?

Answer 24

has at aleast ONE ERUPTION during the past 10, 000 years

Question 25

what are extinct volacones?

Answer 25

had NO ERUPTION in the past 10, 000 years and is not likely to erupt

Question 26

what are active erupting volanoes?

Answer 26

having an eruption

Question 27

what is domant active volcanoes?

Answer 27

not erupting but will most likely erupt again

Question 28

where are volcanoes found?

Answer 28

on the edges of tectonic plates

Question 29

what is a volcanic hot spot?

Answer 29

an are where the mantle rises from the heat as a thermal plume deep in the earth

Question 30

what are oceanic volcanoes?

Answer 30

move away from he hot spor, which then cools and subcide

Question 31

what do oceanic volcanoes produce?

Answer 31

islands, atolls and sea mounts

Question 32

what are examples of oceanic volcanoes?

Answer 32

Hawaii and Samoa

Question 33

what are continetal volcanoes?

Answer 33

move away form hot spot, cool and subcide and become extinct

Question 34

what are examples of contiental volcanoes?

Answer 34

western Victoria and Queensland

Question 35

what kind of volcanoes do Australia have?

Answer 35

extinct volcanoes

Question 36

what are examples of extinct volcanoes in Australia?

Answer 36

Mount Gambier and Mt Shank

Question 37

who do Australia have less volcanic activty and earthquakes?

Answer 37

centre of the Indo Australia plate