Plate Tectonics
Plate tectonics is a scientific theory that describes the large-scale
motions of Earth's lithosphere. The model builds on the concepts of continental
drift, developed during the first few decades of the 20th century
motions of Earth's lithosphere. The model builds on the concepts of continental
drift, developed during the first few decades of the 20th century
Continental drift
Continental drift is the movement of the Earth's continents relative to
each other by appearing to drift across the ocean bed. It seem to be that
continents might have 'drifted' was first put forward by Abraham Ortelius in
1596
each other by appearing to drift across the ocean bed. It seem to be that
continents might have 'drifted' was first put forward by Abraham Ortelius in
1596
Asthenosphere
The asthenosphere is the highly viscous, mechanically weak and
ductilely-deforming region of the upper mantle of the Earth. It lies below the
lithosphere, at depths between ~80 and ~200 km below the surface.
ductilely-deforming region of the upper mantle of the Earth. It lies below the
lithosphere, at depths between ~80 and ~200 km below the surface.
Mid-Ocean ridge
A mid-ocean ridge is a general term for an underwater mountain system that
consists of various mountain ranges, typically having a valley known as a rift
running along its spine, formed by plate tectonics
consists of various mountain ranges, typically having a valley known as a rift
running along its spine, formed by plate tectonics
Rift Valley
A rift valley is a linear-shaped lowland between several highlands or
mountain ranges created by the action of a geologic rift or fault.
mountain ranges created by the action of a geologic rift or fault.
Subduction
In geology, subduction is the process that takes place at convergent
boundaries by which one tectonic plate moves under another tectonic plate and
sinks into the mantle as the plates converge
boundaries by which one tectonic plate moves under another tectonic plate and
sinks into the mantle as the plates converge