study the image about convection currents. at which location does heat transfer begin as dense material…

study the image about convection currents. at which location does heat transfer begin as dense material heats up? 1 2 3 4
Answer
Brief Explanations:
Convection - current heat transfer in Earth's mantle starts at the heat - source location. The core (location 4) is the main heat source. As dense material near the core heats up, convection currents begin.
Answer:
4