Hazardous
Earth
, Oceanic crust : 5-10 km thick
,
basaltic
,
dense 3glam
Continental cust : 30-70 km thich
, granitic ,
less dense 2
Tglan
.
Tectonic theory
:
1 .
Weghner-Pangea , fossil +
geological fit accross continents
.
2 Hess sea floor mid
spreading + ocean
ridges
-
.
3 Paleomagnetism - Reversed magnetic strips -
Show Oceanic crust
formation
Plate Boundaries
constructive -
plates more apart
to
magna + fill gap
-
Basaltic low lava Shield volcanoes
viscocity
-
>
-
,
-
Shallow earthquakes ↳ effusive
Destructive :
·
Oceanic-continental
denser plate subducts under continental
-
oceanic
·
Oceanic -
oceanic
-
older
plate Subducts
Continental
· -
Continental
-
plates crumple to form mountains
=
Explosive volcanoes
(andesitic/rhyolitic
Conservative -
plates slide past
no volcanoes
generation
>
no
magna
- -
-
high friction >
-
shallow+ powerful earthquakes
↳ stress release
Earth
, Oceanic crust : 5-10 km thick
,
basaltic
,
dense 3glam
Continental cust : 30-70 km thich
, granitic ,
less dense 2
Tglan
.
Tectonic theory
:
1 .
Weghner-Pangea , fossil +
geological fit accross continents
.
2 Hess sea floor mid
spreading + ocean
ridges
-
.
3 Paleomagnetism - Reversed magnetic strips -
Show Oceanic crust
formation
Plate Boundaries
constructive -
plates more apart
to
magna + fill gap
-
Basaltic low lava Shield volcanoes
viscocity
-
>
-
,
-
Shallow earthquakes ↳ effusive
Destructive :
·
Oceanic-continental
denser plate subducts under continental
-
oceanic
·
Oceanic -
oceanic
-
older
plate Subducts
Continental
· -
Continental
-
plates crumple to form mountains
=
Explosive volcanoes
(andesitic/rhyolitic
Conservative -
plates slide past
no volcanoes
generation
>
no
magna
- -
-
high friction >
-
shallow+ powerful earthquakes
↳ stress release
