When scientists mixed lighter sand with heavy sand, the lighter, less-dense sand began forming globule-like structures as they migrated upwards.
Ngesikhathi ososayensi bexuba isihlabathi esilula nesihlabathi esisindayo, isihlabathi esilula, nesikhanyayo saqala ukwakha amagobolondo amancane ayizindilinga njengoba ekhuphukela phezulu.