Definition, Meaning & Synonyms
sima
noun
/ˈsiːmə/
Definition
The lower layer of the Earth’s crust, primarily composed of silica and magnesium.
Examples
- The sima is believed to be around 30 kilometers thick beneath continental regions.
- Geologists study the sima to learn about tectonic plate movements.
- Volcanoes can be linked to the processes occurring in the sima layer.
Meaning
In geology, ‘sima’ refers to the dense layer beneath the Earth’s crust that is rich in silicate minerals, which are essential for understanding the composition and structure of Earth.
Synonyms
- Lower crust
- Siliceous layer
- Subcrust
