The flow of heat from Earth's interior to the surface is estimated at 47 terawatts<span>(TW) and comes from two main sources in roughly equal amounts: the radiogenic heat produced by the radioactive decay of </span>isotopes<span> in the mantle and </span>crust<span>, and the primordial heat left over from the formation of the Earth.</span>
I’m going to go with c because sometimes it’s the spelling of my words why it’s not searching up correctly I could be wrong though it could be c or d
Answer: B. Metamorphic rocks
Explanation: Metamorphic rocks are those that have undergone changes due to extreme heat and pressure. Thus, the rock, from which it becomes a metamorphic rock, is heated at temperatures above 150-200 ° and exposed to a pressure of 1500 bar. In this way, the structure of the rock is changed, in terms of the arrangement of the atoms, and the result is a change of physical and chemical properties. There are two basic types of metamorphic rocks: foliated and slate. Generally, some of the metamorphic rocks are anthracite, schist, quartzite, marble, etc.
