What is "upwells"

Usage examples of "upwells".

So magma upwells, lava spills out, over and over and over, and it is deposited over softer material—probably the gardened regolith that resulted from the intensive meteor bombardments of the planet’s earliest years.

So magma upwells, lava spills out, over and over and over, and it is deposited over softer material - probably the gardened regolith that resulted from the intensive meteor bombardments of the planet's earliest years.

They distorted the neat arrangement of bands, chaos engines churning the usual colors into freakish shades with oceanic-sized upwells of weird chemicals from the unseen depths.

Hot molten rock, called lava, upwells through tubes in the upper layers of the Earth – tubes of structural weakness through which the underlying pressure is relieved – and produces large surface piles of cooling volcanic slag.