sima

неисчисляемое

A noun referring to the continuous lower layer of the Earth's crust, which is rich in silicon and magnesium.

• 🇷🇺Существительное, обозначающее непрерывный нижний слой земной коры, богатый кремнием и магнием.

1. Lower layer of Earth's crust C2 formal scientific

   The continuous lower layer of the Earth's crust, composed primarily of silica and magnesium, underlying the sial layer.

   • The sima layer is denser than the sial layer above it.
   • Geologists study the sima to understand tectonic plate movements.
   • The composition of sima is rich in silicon and magnesium.

   🇷🇺Сима