Interior of the Earth
Earth is a dynamic planet. The surface of the earth is visible to us, but how can we know about the interior of the earth?
There are direct and indirect sources to study about the interior structure of the earth.
Direct sources include volcanic eruptions, mining areas and drilling projects.
The indirect sources on the other hand include analysis of the properties of matter, like temperature, pressure and density of material. Some of the other indirect sources include meteors, gravitation, magnetic field and seismic activity.
The study of seismic activity relates to the earthquake waves. Earthquake waves can be broadly classified into body waves and surface waves.
Volcanoes are another important source of information about the interior of the earth. Volcanoes are of various types classified on the basis of periodicity and on the basis of landforms developed.
On the basis of periodicity, volcanoes can be classified as:
Dormant volcano and
And on the basis of landforms formed volcanoes can be classified as:
Flood basalt province and
Mid oceanic ridge volcano
Volcanoes produce various types of intrusive and extrusive landforms. Intrusive landforms are formed inside the earth, while the extrusive landforms are formed on the surface of the earth.