The rocks on Earth are constantly changing due to many different processes. There are three main types of rock, with rocks changing between each type over millions of years.

Even if you’ve been living under a rock, you have experienced the Water Cycle in action. Rain falling from the sky, water seeping into the ground, a flowing river, plant roos sucking up moisture ...

Limestone, for example, is a sedimentary rock made exclusively of the mineral calcite (CaCO3). Glacier ice too, is a type of rock composed of crystals of water.

It is the first fully documented and dated example of what the team have termed a "rapid anthropoclastic rock cycle", which behaves like natural rock cycles but includes human material and happens ...