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
2. The earth's crust. The solid outer layer of the earth, the crust, consists of the CONTINENTAL CRUST, about 20-70 km thick, and the OCEANIC CRUST, which is thinner (5-10 km thick) and overlaid by the oceans. 3. Rocks and minerals.Rocks are solid pieces of the earth's crust, formed over very long periods of time.he solid outer layer of the earth, the crust, consists of the CONTINENTAL CRUST, about 20-70 km thick, and the OCEANIC CRUST, which is thinner (5-10 km thick) and overlaid by the oceans. 3. Rocks and minerals.