Although most major rivers on Earth flow in a single direction from their source to the sea, the Amazon defies ...

The Sun is the original source of energy for almost all organisms on the Earth. The way energy passes through an ecosystem is described as energy flow. Herbivores (plant eating animals ...

Earth’s solid inner core appears to have changed shape in the past 20 years or so, according to seismic wave measurements – but the behaviour of these waves could also be explained by other ...