Melting and Interior Energy
Melting and Interior Energy is a Grade 7 science concept from Amplify Science (California) Chapter 2: Sediment and Magma, explaining that creating magma requires enormous heat energy sourced from Earth interior rather than the sun. This internal heat — from the planet core and radioactive decay — melts solid rock into liquid magma, a process fundamentally different from surface weathering.
Key Concepts
Creating magma requires melting solid rock, a transformation that demands a massive input of energy. This energy comes from Earth's interior , which remains extremely hot due to the planet's core and radioactive heat.
When solid rock absorbs enough of this internal heat, it turns into liquid magma. This distinguishes melting from weathering; melting is driven by the Earth's own internal power, not the sun.
Common Questions
What energy source melts rock into magma?
Earth internal heat — generated by the planet radioactive core and radioactive decay of elements — provides the thermal energy needed to melt solid rock into magma deep underground.
How is magma formation different from surface weathering in terms of energy?
Magma formation is powered by Earth internal heat deep underground. Surface weathering is powered by solar energy through weather processes like rain and wind. The two processes use entirely different energy sources.
Why does rock melt underground but not at the surface?
Underground, Earth internal heat generates temperatures high enough to exceed the melting point of rock. At the surface, temperatures are much lower because solar energy cannot penetrate deep enough to generate that level of heat.
What do Grade 7 students learn about melting and interior energy in Amplify Science?
In Chapter 2 of Amplify Science California Grade 7, students learn that magma forms when Earth internal heat melts rock, distinguishing this process from solar-powered surface weathering and understanding both as part of the rock cycle.