Diametrically Different Dimensions: Aqua & Tbolt

Amidst the myriad of dimensional planes attached to the various universes throughout the DC Multiverse, those associated with Earths One and Two have a pair that are distinct from one another. While the 4th dimension (Bgztl and Duomal respectively), the 5th dimension (each with its own planet Zrfff) and the 7th dimension worlds of each universe are remarkably similar, those of the two elemental dimensions are diametrically different. These realities known as Dimension Aqua and Thunderbolt Dimension have unique natures apart from each other, tied directly into how fundamental forces work differently in each.

Dimension Aqua was first encountered when Queen Mera of it predominant world fled that dimensional plane for that of Earth-One, when her throne was usurped. Encountering Aquaman and his sidekick Aqualad, the trio battled the evil Leron and his force seeking to recapture her and obtain the science behind the dimensional warp which led Mera to Earth. To combat Leron and his henchmen's mastery over hydrokinesis, Aquaman recruited the water-sprite named Quisp, who attempted to gather his fellow sprites to help Mera liberate her realm. Although Quisp and his fellow sprites were unsuccessful, Mera and the boys were able to thwart Leron.

Thunderbolt Dimension was first entered by humans arriving from Earth-Two shortly after the Justice Society along with Earth-One's Justice League battled the alien antagonist known as Aquarius. As she just lost her husband Larry Lance in death during the battle, Black Canary herself was also succumbing to radiation poisoning from the battle. Superman brought her to this dimension to see her daughter Dinah, who had been sleeping in suspended animation for decades following her traumatic metahuman mutation as a baby, Johnny Thunder's Thunderbolt transferred the memories of mother in to daughter, with the young Dinah now gaining her mother's maturity allowing her to master her sonic screams that plagued her as a child. Years later, she along with Starman would return to the Thunderbolt Dimension, when Johnny's Earth-One counterpart temporarily took control over the Thunderbolt.

While Dimension Aqua had Atlantean-like humans as its residents, the Water Sprites were native to Earth-One. The Thunderbolt Dimension had the Sprites' counterparts the Thunderbolts as residents, while the Aqua-humans' doppelgängers (such as Mera's counterpart Eeras) were native to Earth-Two. As with the intrinsic nature of Hard Water and Lightning Bolts differing in each universe, So too the physics of these parallel Dimensions mirror this. Hard water grants superhuman speed on Earth-Two which lightning grants on Earth-One. Conversely, lightning creates solidified constructs on Earth-Two and hard water does the same on Earth-One.