Why are there continent-sized 'blobs' in the deep Earth?

Why are there continent-sized 'blobs' in the deep Earth?Why are there continent-sized 'blobs' in the deep Earth? External link

In a strange corner of our solar system live two alien blobs. With sprawling, amorphous bodies the size of continents, these oddities are thought to spend their time lying in wait for their food to rain down upon them – then simply absorbing it.

Tagsearthlavatectonics
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