What evidence shows that liquid water existed on Earth more than 4.3 billion years ago?

The primary evidence for the existence of liquid water on Earth more than 4.3 billion years ago comes from the analysis of ancient zircon crystals found in the Jack Hills region of Western Australia.12

While the geologic record for intact rocks is largely absent prior to 4.0 billion years ago, these durable zircon grains have been dated to approximately 4.4 billion years old. Some scientists interpret the chemical signatures within these crystals as evidence that stable continents, liquid water, and surface temperatures below 100 °C (212 °F) existed during the early Hadean Eon. This discovery suggests that the Earth's atmosphere and oceans may have formed significantly earlier than previously thought, potentially predating the intense period of meteorite bombardment that characterized the planet's earliest stages.12