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
And also consider that the rocks of the seafloor, the oceanic crust, have almost no quartz at all but abundant feldspar. So in the Earth's crust, feldspar in the most common mineral. BUT, 3. The Earth consists of a very thin rocky crust on top of a very thick rocky mantle.Compared to the mantle, the crust is small enough to ignore. And the most common mineral in the mantle is olivine, or at least the compound (Mg,Fe) 2 SiO 4.nd also consider that the rocks of the seafloor, the oceanic crust, have almost no quartz at all but abundant feldspar. So in the Earth's crust, feldspar in the most common mineral. BUT, 3. The Earth consists of a very thin rocky crust on top of a very thick rocky mantle.