Sima

Sima is a term used in geological sciences to refer to the lower layer of the Earth's crust. This layer is primarily composed of silicate and magnesium based rocks, hence the name 'sima' which is an acronym derived from the first two letters of 'silicate' and 'magnesium'. The sima layer lies beneath the sial which is the upper layer of the Earth's crust.

Composition

The sima layer is rich in iron and magnesium. It is predominantly made up of silicate rocks, specifically basalt and gabbro. These rocks are denser than the granite rocks found in the sial layer above.

Location

The sima layer is located beneath the sial layer and above the mantle. It forms the oceanic crust and the bottom of the continental crust. The thickness of the sima layer varies, but it is generally thicker under the oceans due to the presence of denser basaltic rocks.

Significance

Understanding the composition and location of the sima layer is crucial in the study of plate tectonics. The movement of the sima and sial layers is responsible for the creation of mountain ranges, earthquakes, and volcanoes. The sima layer is also important in the study of seismology as it affects the propagation of seismic waves.

See also

• Sial
• Mantle
• Plate tectonics
• Seismology

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