Babies have about 300 bones at birth, with cartilage between many of them.
This extra flexibility helps them pass through the birth canal and also allows for rapid growth.
During this process, carbon dioxide and water are converted into energy, releasing oxygen as a by-product.Coccolithophores are just one of many prehistoric species that have been immortalised in fossil form, but how do we know how old they are?Over time, rock forms in horizontal layers, leaving older rocks at the bottom and younger rocks near the top.Covering 5.5 million square kilometres (2.1 million square miles), the Amazon rainforest cycles a significant proportion of the Earth’s oxygen, absorbing large quantities of carbon dioxide at the same time. Some metals are so reactive that they explode on contact with water There are certain metals – including potassium, sodium, lithium, rubidium and caesium – that are so reactive that they oxidise (or tarnish) instantly when exposed to air.They can even produce explosions when dropped in water!With age, many of the bones fuse, leaving 206 bones that make up an average adult skeleton. The Eiffel Tower can be 15 cm taller during the summer When a substance is heated up, its particles move more and it takes up a larger volume – this is known as thermal expansion.Conversely, a drop in temperature causes it to contract again.Hot, less-dense rock rises before cooling and sinking, giving rise to circular convection currents which act like giant conveyor belts, slowly shifting the tectonic plates above them.Hawaii sits in the middle of the Pacific Plate, which is slowly drifting north-west towards the North American Plate, back to Alaska.The mercury level inside a thermometer, for example, rises and falls as the mercury’s volume changes with the ambient temperature.This effect is most dramatic in gases but occurs in liquids and solids such as iron too.