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
Lesson 1 The Earth's Layers. 1  Crust -The outer layer of the Earth. 2  Oceanic Crust -Made of dense basaltic rock. 3  Continental Crust -Made of light granitic rock.  Mantle -Largest layer of the Earth located directly under the crust.