Noun. 1. heat sink-a metal conductor specially designed to conduct (and radiate) heat. conductor-a device designed to transmit electricity, heat, etc. sink - (technology) a process that acts to absorb or remove energy or a substance from a system; the ocean is a sink for carbon dioxide.
The crust is composed of many different types of rocks that fall within three main categories: igneous, metamorphic and sedimentary. However, most of those rocks originated as either granite or basalt. The mantle beneath is made of peridotite. Bridgmanite, the most common mineral on Earth, is found in the deep mantle. How We Know the Earth Has a Crust
Accordingly, the crust is divided into two types; the continental crust and the oceanic crust. Oceanic Crust. The oceanic crust is that part of the Earthâs crust that covers the ocean basins. It consists of dark-colored rocks made up of basalt.This rock is made up of silicon, oxygen, and magnesium.The density of the oceanic crust is about 3.0 g/cm3.The continental crust has a lower density. This difference in the average densities allows many natural phenomenon to occur on and below the surface of the Earth. The oceanic crust scarcely floats on the mantle.t consists of dark-colored rocks made up of basalt. This rock is made up of silicon, oxygen, and magnesium. The density of the oceanic crust is about 3.0 g/cm3. The continental crust has a lower density.