Plate Boundires (Divergent (Eruptions of mama occur underwater. (Due to…
Eruptions of mama occur underwater.
Due to the magma hitting the water straight away this causes a pillow lava
Long chains of mountains 3000m above the sea bed.
Remain hidden at depths of 2.5km
Magma Rising to the Asthenosphere and forcing its way to the surface.
Locations where plates are moving towards each other.
North American and Pacific.
Sanadreas Fault system.
frictional forces often snag and cause a build up in tension
When this pressure is released it sends out massive amounts of force often causing earthquakes.
Volcanic activity is absent
Slide past each other
causes deepening of the ocean. And forms an
Ocean trenches mark the locations of a subduction zone.
An ocean trench is a long narrow depressions with depths of 6000-11000 m deep, they are usually asymmetric.
Different densities causing the denser one (oceanic) to sub-duct under the continental crust.
Nuclear Testing underground caused shocks that where picked up on seismometers.
This showed and produced detailed seismic data worldwide that shew earthquakes were spatially concentrated into narrow bands.
Plate tectonics gained acceptance in the late 1950's