Earth formed 4.5 billion years or so ago. Ever since then, it's been slowly cooling on the inside.
above it. This boundary mineral is called bridgmanite, and how quickly it conducts heat will influence how quickly heat seeps through the core and out into the mantle.
"This measurement system let us show that the thermal conductivity of bridgmanite is about 1.5 times higher than assumed,"In turn, this means that the heat flow from the core to the mantle is higher than we thought – and, therefore, that the rate at which Earth's interior is cooling is faster than we thought.
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