Like all materials, sugar and water are both made of very small particles.  What happens when you add the sugar particles to the water particles?  Imagine your school football team running onto the pitch - they are very visible! ...

The Northern Lights (or Aurora Borealis) are visible near the North Pole of the Earth, while the Southern Lights (or Aurora Australis) are visible only near the South Pole.  Both have the same cause - the sun - and both are...

Centigrade (or Celcius) is the name of the unit for temperature. 

So, for example, a hot day may have a temperature of 'thirty degrees centigrade' .This means the same as 'thirty degrees Celcius'.

We shorten this to: 30...

Tooth decay or dental caries is caused by bacteria in the mouth. These bacteria  form plaque, a sticky soft film on the the teeth, building up naturally even on clean teeth. 

The other thing which is also happening is...

Herbivores such as cows only eat plants, so their teeth are flat and blunt to chew and grind the plant material.  Mostly, they do not have canine teeth, the sharp pointed teeth at the front, because they do not need them to tear meat...