So-called ultralow-velocity zones (ULVZs) are known as structures that slow down the passage of seismic waves, with research conducted in the 1990s showing that seismic waves are slowed up to 50 percent as they pass through areas between the mantle and the core of Earth.
"Over billions [of] years of the Earth’s shaping and reshaping, these zones have churned close to the planet’s core but largely remained intact. It’s like an egg in a cake that doesn’t get mixed in with the rest of the ingredients but stays as yoke and egg white, despite the constant mixing all around it."-
Learn More: https://sputniknews.com/20220105/mysterious-structures-near-earths-core-could-be-leftovers-from-planets-formation-scientists-say-1092044737.html?utm_source=dlvr.it&utm_medium=twitter
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