More on Centre of Gravity from Fact Monster:

• GRAVITY - Gravity is the force that makes things fall to the ground on Earth and holds the planets in their orbits (paths) around the Sun. The force of gravity
• MOVING ABOUT - No-one has ever seen a dinosaur in action. However, the bones and the joints of fossilized skeletons can give us clues as to how the animals moved. Ma
• FORCES AND ENERGY - From the movements of the planets to the energy produced inside atoms, everything that happens in the Universe is ultimately caused by forces. A force
• DIGESTIVE SYSTEMS - Carnivorous and herbivorous dinosaurs are quite easy to tell apart. As well as the different types of jaws and teeth, their body shapes were distinct

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