Other slides in this set

Slide 2

Preview of page 2

Here's a taster:

Aa - blocky (no gas/viscous)
Pahoehoe ­ ropy (fluid)
Types of Lava
Peter Copley Feb 04…read more

Slide 3

Preview of page 3

Here's a taster:

MAGMA COMPOSITION
`Acidic' ­ high silica, low temperature (~ 800 deg C), viscous.
eg Andesite, Rhyolite
Gases are trapped, violent explosions, pyroclastics.
`Basic' ­ low silica, high temperature (~ 1200deg C), fluid.
eg Basalt
Gases can escape, gentle eruptions, lava
Peter Copley Feb 04…read more

Slide 4

Preview of page 4

Here's a taster:

Mt Pinatubo
Phillipines
Ash Cloud
Peter Copley Feb 04…read more

Slide 5

Preview of page 5

Here's a taster:

Pyroclastic
Flow
(Nuee
Ardente)
Very hot (~1000 deg C)
Ash and volatiles. Flows very fast
Rock formed is an
Ignimbrite ( eg
Snowdonia)
Peter Copley Feb 04…read more

Slide 6

Preview of page 6

Here's a taster:

TEPHRA
A general term
to include
ash,lapilli,
blocks &
bombs
Peter Copley Feb 04…read more

Slide 7

Preview of page 7
Preview of page 7

Slide 8

Preview of page 8
Preview of page 8

Slide 9

Preview of page 9
Preview of page 9

Slide 10

Preview of page 10
Preview of page 10

Comments

No comments have yet been made

Similar Geology resources:

See all Geology resources »See all resources »