Interior of the Earth

Interior of the earth: Just read these solved multiple choice and short questions answer and get 100% marks of short question in the examination.

  • The earths radius is 6370 km.
  • The gold mines in South Africa is 3-4 km deep.
  • “Deep ocean drilling project”, “integrated ocean drilling project” etc. are the project related to the study of the interior of the earth.
  • Deepest drill in the world is Kola in Arctic ocean.
  • The reading of the gravity at different places is different, because it is influenced by several other factors. It is known as gravity anomaly.
  • The point where the energy is released is called the focus of an earthquake.
  • The point on the surface, nearest to the focus, is called epicenter.
  • An instrument called “seismograph” records the waves reaching the surface. Richter scale is used in this instrument to measure the intensity of earthquake.
  • Among the three types of earthquake wave (P,S and L), ‘L’ wave is responsible for the destruction of any kind of features on the earth surface.
  • ‘P’ waves are similar to the sound waves. And it is faster than other two types of earthquake waves.
  • P waves can travel through gaseous, liquid and solid materials.
  • S waves can travel through solid materials only.
  • The between 105 degree and 145 degree from the epicenter is identified as the shadow zone.
  • The earthquakes are generated due to sliding of rocks along a fault plane, is known as tectonic earthquake.
  • Collapse earthquake mainly occurred in the mining area, due to the collapse of the roofs of the mines.
  • The magnitude of the earthquake is measured by Richter scale (0-10).
  • The intensity of the earthquake is measured by Mercalli scale (1-12).
  • The earth crust:
    Thickness – 5 in oceanic crust and 30 km in the continental crust.
    It is up to 70 km in Himalayan region.
  • Density- 3g/cm3
    Oceanic crust is mainly formed by basalt rock.
  • The Mantle:
    The boundary line between the earth crust and the mantle is known as Moho’s discontinuity.
    The mantle extends from Moho’s discontinuity to a depth of 2900km.
    The upper part of the mantle us known as asthenosphere (The source.
    Density – 3.4g/cm3.
  • The core:
    Depth – 2900-6300km.
    Density – 5g/cm3.
  • Hawaiian volcanoes are the best example of shield volcanoes.
  • The mid oceanic ridge in the Atlantic ocean is about 70,000km long.
  • Sill, dyke, lacolith, phacolith, batholiths etc. are the examples of intrusive volcanic landforms.
  • Caldera, lava plateau, lava mesa etc. are the examples of extrusive volcanic landforms.
  • Lacoliths are large dome shaped intrusive bodies with a level base and connected by a pipe-like conduit from below. In the Karnataka plateau such type of landforms are found.
  • Dykes are commonly found in the western Maharashtra area.