rocks

Cave tours can show limestone – an important regional export – in a different light.

Scientists have found zircon crystals in Australia that are over 4 billion years old. Since the Earth is just over 4 and a half billion years old, those zircon crystals are the closest thing we have to a time capsule from Earth in its early years.

By studying various kinds of rocks, scientists know that our solar system is about 4.6 billion years old. However, in 2019 an international team of researchers reported that they found tiny grains of dust in a meteorite that fell in Australia in 1969 that may be 7 billion years old.