Earth

Earth (or Sol III) is the third planet of the Sol system, located in the Milky Way Galaxy, and is the homeworld of the Human species. In the history of the universe, Earth has proved a focal point of galatic events and often the battleground of the ongoing war of good and evil.

History
The planet formed 4.54 billion years ago. According to Zordon, the war between good and evil began some "millions" of years ago, apparently after the formation of Earth. During that period, sorcerers called the Morphing Masters set a chest out to sea containing twin Power Eggs. 150 million BCE, the Quantasaurus Rex and its Quantum Controller arrive from the 30th century and remain dormant until the arrival of Wes Collins, Eric Myers, and Commandocon arrive taking the zord back to the year 2001. In 65 million BCE, the dinosaurs were eradicated by an asteroid carrying the Dino Gems.

History (Super Sentai)
In the universe of Super Sentai, the history of Earth is rather similar to the actual history of Earth, but there are many differences. In particular, there are many different points within Earth's own history where multiple possibilities could have occurred over certain world events.

The Extinction of the Dinosaurs
Dinosaurs lived on the Earth as a dominant species millions of years ago. However, how they lived and died differs dependent on the Sentai world. The variance of histories between Super Sentai series made continuity errors evident when Gokaiger was aired.
 * In Zyuranger, dinosaurs and humans lived together until the alliance of Witch Bandora and Great Satan nearly annihilated both species. The dinosaurs went extinct while six humans went into a state of cryogenic suspension until Bandora rose once again.
 * In Abaranger, dinosaurs never lived alongside humans, nor did they go extinct. Instead, the arrival of a meteor that presumably wiped the dinosaurs out instead sent all of them to a parallel universe where they evolved into humanoid forms while fighting an unending struggle against the Invasion Garden Evolian, who arrived within the meteor and evolved to fight and attempt to conquer this parallel world.
 * In Go-Onger, a being from an alternate "Braneworld" dimension known as a Horonderthal invaded "Dino World" (a nickname for the actual Earth of this dimension at the time) leading to dinosaurs attacking each other making them go extinct. When humanity became the dominant species of this dimension, the name was likewise changed to "Human World".

Ancient Civilizations and Technology
As the human race rose to emerge as the dominant species of Earth, they acquired many tools and means to use to further develop their civilizations along.