classifying volcanoes Flashcards
1
Q
volcano
A
- Landform created by an intrusion of magma onto the Earth’s crust by extrusive eruption
- Classified by material ejected and type of eruption and activity
2
Q
location of volcanoes
A
- Plate Margins - 60% active volcanoes at divergent or convergent
- ‘Ring of Fire’ - encircling the Pacific Ocean
- Hot Spots - caused in the interior of Hawaiian Islands
3
Q
dormant
A
not currently erupting or likely to soon
4
Q
active
A
has recent history of eruption or is erupting
5
Q
extinct
A
- not expected to erupt again because of no lava supply
- hasn’t erupted in 10,000yrs
6
Q
lava plateaux
A
- A plateau is a natural feature or landform found on the surface of the Earth - like a mountain with a flat top
- often called ‘flood basalts’
- formed during a shield volcano eruption, layers of hardened basalt lava
- eruption on a Rift Valley
7
Q
extrusive
A
lava reaching surface
an extrusive feature is a volcano
8
Q
dykes
A
intrusion - magnetic layer squeezed sideways
9
Q
sills
A
intrusion parallel to stratovolcanoes
10
Q
intrusive
A
lava and magma don’t reach surface
11
Q
archipelago
A
extensive group of islands
