I personally imagined this as either a planet or a moon, e.g. of a bigger planet, maybe a gas giant; the aqua fluid being something similar to acid, and the yellow-white-orange something like lava.
Going by Earth standards, acids can be a byproduct of volcanic gases reacting with water, and very acidic lakes can be around of some Earth volcanoes.

All currently freely available planetary objects with transparent background are in this folder:
Free-Transp-Space-PNG

You are allowed to use this stock in your DeviantArt artwork, as long as you credit me and link back to this deviation: fav.me/dc9bx6z

If you want to use this stock outside of DeviantArt, contact me first to ask for permission.

An 8K high-quality high-resolution version of this submission as well as different 3D models with all layers (e.g. Albedo, Roughness, Ambient Occlusion, Normal map, or features masks like e.g. Water, Ice) will be uploaded and purchasable as soon as possible and then linked here.

Enjoy!
Regards, Meri