What is the difference between a pictograph and an alphabet?

an alphabet is made of letter and pictograph is made of images or symbols like the egyptian alphabet

whats the question? im not quite understanding your question.

ww1 weapons: tank. tanks were used for the first time in the first world war at the battle of the somme. they were developed to cope with the conditions on the western front. the first tank was called 'little willie' and needed a crew of 3.