A Study Shows Why Earth’s Interior Cooling Down Faster Than Expected

A team of scientists in Zurich has revealed that Earth is cooling down much faster than expected.

Earth — the only liveable planet on it — formed 4.5 billion years ago, and since then its interior has experienced temperature changes, according to a study published in Earth and Planetary Science Letters.

Our planet consists of inner and outer cores as well as lower and upper mantles in addition to the crust-covered layer, the outermost tier. The study focused on how much heat the mineral bridgmanite conducts from Earth’s core to the mantle, which is hard to calculate considering experimental verification, Science Daily reported. Bridmanite is one of the main sources of the boundary layer formed between the Earth’s core and mantle.

To better understand the cooling process, we can take a look at the evolution of our blue pale dot as its story tells about its cooling. If the planet has a crusty today, it owes that structure to millions of years of evolution. Nevertheless, thermal energy spurting from Earth’s inside launched “dynamic processes in motion, such as mantle convection, plate tectonics, and volcanism.”

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Cooling Earth: Here’s what results tell us

The scientists involved in the research used a sophisticated measurement method, in which they can measure bridgmanite’s thermal conductivity by simulating the conditions with the help of an optical absorption measuring system. This research also simulated the conditions, such as pressure and temperature that reign inside Earth.

“This measurement system let us show that the thermal conductivity of bridgmanite is about 1.5 times higher than assumed,” said Motohiko Murakami, a planetary scientist leading the research.

What results tell us is that “the heat flow from the core into the mantle is also higher than previously thought. Greater heat flow, in turn, increases mantle convection and accelerates the cooling of Earth,” according to the piece.

“Our results could give us a new perspective on the evolution of the Earth’s dynamics. They suggest that Earth, like the other rocky planets Mercury and Mars, is cooling and becoming inactive much faster than expected,” Murakami said regarding a “cooling Earth.”

“We still don’t know enough about these kinds of events to pin down their timing,” he added.

As we talk about Earth-related changes, you can also see here how climate change is ravaging our habitable planet.