Pleasure CC-BY-ND is the Creative Commons licence you chose: CC - Creative Commons BY - Attribution (I have to acknowledge you in the paper) I think this relates to "this work is BY so & so" ND - No Derivative - it's not stock - I can't mod the image itself
dA is actually a great source of CC material, which for teachers/ students/ hobbyists means there is a rich source of good stuff that can be used perfectly legally.
Our questions are 'scenario' based, and the image accompanied this text: At the Royal show, there are some pretty impressive fireworks. But fireworks also have to obey the laws of physics!
There is a box of identical fireworks, and they are fired off in different circumstances. Work out the physics.
More specifically, I wanted an image of a round explosion for this question: Use the law of conservation of momentum to explain why, when the 100g of chemicals explodes up in the air, the explosion has the exactly round shape it does.
The visual helps the guys for whom English is a second (or third!) language, to understand what I'm asking. I can post a screenshot in scraps if you like.
Thanks for a great image, and the generosity of using CC. Grant H